from where do the gems used in jewelry come?
A. They are non-metallic silicate B. They are metallic minerals C. They are non-metallic minerals D. They are metallic ore
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The gems commonly used in jewelry come from mining efforts and are usually classified as non-metallic minerals.
Jewelry uses a wide variety of gems and other valuable elements such as:
Sapphires EmeraldsGoldSilverTopazand many more. These gems and elements all have distinct properties and therefore classifications.
Gold and silver are considered metallic ore. They are mined and have properties of metals. One of these defining properties is that both gold and silver may be melted and used to produce other substances. However, though they are used in jewelry, they are not considered to be gems.
Gems in jewelry are those that cannot be melted into other substances and have only a dull, submetallic shine, except the diamond. Gems are unique and desired for their colors. Their lack of shine comes from their relatively low refractive index. This is a property common to nonmetallic minerals. Therefore option C is correct.
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Related Questions
Which theorist is responsible for suggesting that the distribution of phobias in the human population can be explained by biological preparedness?
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Seligman in 1971 studied the distribution of phobia in animals. Seligman with Grey (1971) gave the concept of preparedness stating that humans are biologically prepared to be feared by certain animals and these prepared fears involve stimuli.
Which of the following do meteorologists not typically use weather balloons to record? A atmospheric pressure b cloud types c humidity d temperature
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Your answer will be B.) cloud Types
100% correct
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Answer:
cloud types
Explanation:
why you need to know cloud types
The insula is considered to be part of the ________. the insula is considered to be part of the ________. hypothalamus cerebrum cerebellum thalamus
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_________________________________________
The correction option is d) cerebrum
What is insula?The insula, insular cortex or the insular lobe is a part of the cerebral cortex located in both hemispheres.
Anatomically insula is a thin ribbon of gray matter tissue folded deep within the lateral sulcus that lies just deep to the lateral brain surface, separating the temporal lobe from the inferior parietal cortex.
The insula is involved in gustatory and sensorimotor processing, risk-reward behavior, autonomics, pain pathways, and auditory and vestibular functioning.
The insula serves connection with the brain structures including Neocortex, Basal ganglia, Thalamus, Limbic system and the olfactory cortex.
Thus, it is clear the insula however, serves connection with different brain structures but it is originally considered to be part of the cerebrum.
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During transcription, which end of the new rna molecule protrudes from the rna polymerase?
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The color of a mineral in powdered form is termed _____.
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When blood volume increases to the point that cardiac cells are stretched, the heart releases what natriuretic hormone?
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Both BNP and ANP can be found in heart tissue. But BNP is more frequently used because its level is higher, thus the laboratory result could be better. Both BNP and ANP has diuretic, natriuretic and antihypertensive effect that can counter the fluid overload in congestive heart failure. That is why they are secreted when the cells are stretched.
Which hormone is produced in fat tissue that helps regulate body fat by signaling the reduction of food intake in the brain?
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The client with a peptic ulcer is prescribed antibiotics and bismuth salts. the nurse explains that this combination of medications will:
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Calcium storage, lipid synthesis, carbohydrate metabolism, and detoxification of harmful substances, all occur in the ______ .
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The smooth endoplasmic reticulum (SER) is the cellular organelle responsible for calcium storage, lipid and steroid hormone synthesis, carbohydrate metabolism, and the detoxification of harmful substances.
Explanation:Calcium storage, lipid synthesis, carbohydrate metabolism, and detoxification of harmful substances all occur in the smooth endoplasmic reticulum (SER). The SER is a critical organelle in cells, especially prominent in those that synthesize large amounts of lipids and steroid hormones, such as the cells of the ovaries and testes, the liver, and certain cells within the nervous system.
The SER serves several vital functions, including the synthesis of carbohydrates, lipids, and steroid hormones; detoxifying chemicals like pesticides, preservatives, medications, and environmental pollutants; and storing calcium ions that are necessary for various cellular processes such as neurotransmitter release in nerve cells.
_________ is the least developed of a newborn baby's senses.
Answers
The least developed sense in a newborn baby is vision.
Explanation:The least developed sense in a newborn baby is vision. Newborns' vision is not yet fully developed as both the retinas and the parts of the brain involved in vision are still immature. Most newborns can only focus on objects that are directly in front of their face and about 46 cm away.
Which molecular property defines the location of electrons?
A) Reactivity
B) Resonance
C) Acidity
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Answers
Answer: Reactivity
Explanation:
The location of electrons in an atom defines the reactivity of the atom. The number of electrons that is found in the outermost shell defines its reactivity.
The tendency of an atom to take part in a chemical reaction is defined as reactivity.
Noble gases have low reactivity because they have valence electrons in the outermost shell.
The atoms that have not completed their octet are not stable and have high reactivity. Example: chlorine , fluorine
help me pleaseeeee and thankyouuuu
Answers
one can be that Substance X is specific to only certain materials (it's like a puzzle)
another one is that the active site of X does not fit a different substrate
let me explain it to you so you will understand, it is like a lock and key. You see how every lock has its own key? so does this
True or false: a neuron can release more than one kind of neurotransmitter.
a. True
b. False
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When blood returns from the pulmonary circuit, it first enters the ____ chamber of the heart?
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Oxygen-rich blood flows from the lungs into the left atrium through the pulmonary veins.
What is the structure of the heart?The human heart is a muscular, four-chambered organ that is about the size and form of a man's closed fist, with two-thirds of the mass located to the left of the midline.
The parietal walls of a serous membrane border the pericardial sac, which houses the heart. The epicardium is made up of the serous membrane's visceral layer.
The heart wall is made up of three layers of tissue. The epicardium, myocardium, and endocardium are the heart wall's three outer, middle, and interior layers, respectively.
Blood from the veins enters the two atria, which have thin walls. The heart's two ventricles, have strong walls and powerfully pump the blood out of the organ. The quantity of myocardium in each heart chamber varies, reflecting the force that each chamber must provide, and this results in changes in the thickness of the heart chamber walls.
Systemic veins deliver deoxygenated blood to the right atrium, whereas pulmonary veins deliver oxygenated blood to the left atrium.
Therefore, oxygen-rich blood flows from the lungs into the left atrium through the pulmonary veins.
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Many plants that grow in tropical rain forests have specialized roots that anchor them to the branches and trunks of trees. They do not harm the trees. These plants get food and water from various sources, including the air and dead organic matter found on the trees.One example of these plants found in tropical rain forests is the bromeliad. Its leaves form a cup-like structure that is able to hold water. This water provides a feeding and breeding area for many insects and frogs. Snakes and lizards also come to these plants in search of food and water. A cross-section showing the inside of a bromeliad is shown below. Which of these types of organisms break down dead organic matter in the rain forest?
Answers
D: decomposes. since there main job is to eat things that are decomposing.
Producers I don't think eat anything, predators defiantly don't eat decomposing things.
Hope this helped
Answer:
Decomposes
Explanation:
Decomposing organisms are those that draw energy from decomposing organic matter. They are in the group of fungi, bacteria and protozoa. The importance of decomposers for the balance of the ecosystem is enormous, since they guarantee the recycling of decomposed materials and generate nutrients for the maintenance of the ecosystem.
The intermediate stage between snow and glacial ice is called
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Describe glycolysis in terms of energy input, energy output, and net gain of atp.
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Glycolysis is a cellular process that converts glucose into pyruvate, resulting in a net gain of 2 ATP and the production of 2 NADH molecules. The process starts with an energy investment of 2 ATP and concludes with the generation of 4 ATP, hence the net gain. This ancient and universal pathway does not depend on oxygen, allowing it to function under various conditions.
Explanation:Glycolysis Overview
Glycolysis is a series of biochemical reactions that breaks down glucose into pyruvate, producing ATP (adenosine triphosphate) and NADH (nicotinamide adenine dinucleotide) in the process. It begins with an energy input phase where 2 ATP molecules are used to convert glucose into a form that can be split into two three-carbon molecules. This is followed by the energy output phase, which results in the production of 4 ATP and 2 NADH molecules. The net gain of ATP during glycolysis is 2, as the initial investment of 2 ATP results in a total of 4 ATP, thus making a net gain of 2 ATP molecules.
Why is Glycolysis Important?
Glycolysis is a universal and ancient metabolic pathway, indicating that it was present in the earliest forms of life and is conserved across all domains of life today. This pathway is not oxygen dependent, which means it can occur both in the presence and absence of oxygen, making it adaptable to a variety of cellular conditions.
The first event to occur when an adequate stimulus is applied to a neuron is
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A)the membrane potential moves immediately to + 30m V
B)the potassium channels open
C)the sodium channels are inactivated
D)some of the sodium channels at the point of stimulation open
Among those choices, the best answer would be D) Some of the sodium channels at the point of stimulation open.
A student does an experiment for a science fair to study whether temperature affects the timing of a cricket’s chirps. The student keeps a cricket in an enclosed box that is heated to different temperatures each day for twelve days. The student records the cricket’s chirps by using a sound-activated microphone so the timing of the chirps can be measured. Which is the dependent variable in this experiment?
size of the box
temperature of the box
timing of the cricket’s chirps
volume of the cricket’s chirps
Answers
Answer: timing of the cricket's chirps.
Explanation:
In an experimental setup, an independent variable is the variable which can be changed or manipulated in an experiment, the affect of which can be observed on the dependent variable.
Dependent variable is the variable the changes in which are the outcomes of the experiment.
According to the given situation, timing of the cricket's chirps is the example of dependent variable which changes due to the affect of temperature.
Answer:
C
Explanation:
edge 2021
Which type of epithelial tissue shown is a stratified tissue?
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Scientists distinguish whether an entity is a living or nonliving by describing the.....? of life.
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Answer:
the correct answer would be- characteristics of life.
Explanation:
Distinguishing an entity as a living entity or nonliving entity scientifically is not based on one single thing or character. It is determined by the various characters of life.
The characteristics of life that are helpful in finding out if an individual entity is living or non-living are-
Homeostasis ability,
ability to use energy and obtain it,
Ability to reproduce,
Complexity,
Movement,
Metabolism, and
Heredity.
Thus, the correct answer is - characteristics.
A hole is made in an opaque sheet of paper. A monochromatic variety of light is shot at the paper from one side. On the opposite side of the paper, the effects of diffraction will be greatest when the light has a _______ and the hole is _______. A. long wavelength; small B. high frequency; small C. low frequency; large D. short wavelength; large
Answers
Diffraction is the greatest whenever the gap where the wave is passing through is smaller. This gap property will make the wave to "curve" reaching a more wider area, the smallest the gap is, more the wave will curve, spreading more widely. The light would propagate more rather then being concentrated on one focus. The wavelength is also something that affects diffraction. Whenever the wavelength is longer, the wave will have more time to spread sideways after diffraction.
Answer:
THANK ME its B on usa testprep
Explanation:
A. long wavelength; small
Diffraction is the greatest whenever the gap where the wave is passing through is smaller. This gap property will make the wave to "curve" reaching a more wider area, the smallest the gap is, more the wave will curve, spreading more widely. The light would propagate more rather then being concentrated on one focus. The wavelength is also something that affects diffraction. Whenever the wavelength is longer, the wave will have more time to spread sideways after diffraction.
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Mineral-rich water, heated by newly formed oceanic crust, escapes through cracks in the ocean floor called _____.
A)hydrothermal vents
B)rifts
C)hydrothermal trenches
D)nodules
PLEASE NO BS ANSWERS.THEY WILL BE DELETED!
Answers
Answer:
Option (A)
Explanation:
Hydrothermal vents are the vents that are formed due to the eruptions of the underwater volcanoes. It is the region where the magma coming out to the surface reacts with the seawater. This seawater gets heated and emerges again to form these vents.
Hydrothermal vents are responsible for holding specific types of ecosystems containing various species of organisms within the deep ocean. It balances the chemical composition of ocean and the circulation of essential minerals.
These vents emit black as well as white smokes which are commonly known as black smokers and white smokers respectively.
Thus, the correct answer is Option (A).
Two rabbits, one with a brown coat (Cc) and the other with a white coat (cc), are crossed. What are the likely results of this cross? All of the offspring will have white coats, and none will have brown coats. One–half of the offspring will have brown coats, and one–half will have white coats. All of the offspring will have brown coats, and none will have white coats. NextReset
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Definition: this is the scale used to describe how acidic or basic a solution is. this affects the enzymes within living systems.
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Answer:
PH
Explanation:
science
What does the mass of an object depend on? Force of gravity Temperature of the object Time taken for an event to occur Amount of matter that makes up the object
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if the same object is placed in different force of gravity rate, the mass will still be unchanged.
The amount of matter that makes up an object.
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Asexual reproduction has low genetic variability. Where does the variation in offspring come from? A) Random fertilization of gametes B) Crossing over events during mitosis C) Genetic mutations and replication errors D)Arrangements of chromosomes in metaphase I
Answers
Answer:
C) Genetic mutations and replication errors
Explanation:
Variations in the progeny produced by asexual reproduction come from mutations and errors during DNA replication. Mutations are the sudden random changes in the genome that add variations. Replication is the process of DNA synthesis; any error during DNA replication leads to genetic variations in the progeny.
Since asexual reproduction does not include fusion of gametes, fertilization can not add variations to the progeny produced by asexual reproduction.
Which could be a reason viruses are considered nonliving things?
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Mentally rehearsing one's resentments contributes to ________ perspiration levels and ________ blood pressure levels than mentally rehearsing forgiveness.
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Mentally rehearsing one's resentments contributes to higher perspiration levels and higher blood pressure levels than mentally rehearsing forgiveness.
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The interactions that occur in a pond are part of a(n) _____.