Convection currents in Earth's mantle result from heat transfer from the core, causing mantle material to circulate in a pattern that drives tectonic plate movement. Hot mantle material rises, cools, and then sinks back, creating a continuous convective cycle.
The convection currents in Earth's mantle are movements of the mantle material caused by the internal heat from Earth's core. Think of it like a pot of water on the stove, where the heated water expands, becomes less dense, and rises, while cooler water sinks to replace it, setting up a continuous circulating pattern.
Inside Earth, heat is continuously transferred from the core to the mantle, causing mantle convection. Although the mantle is solid rock, it can flow very slowly over time. These mantle convection currents are the primary driving force behind the movement of tectonic plates. Underlying convection cells can push the plates apart at mid-ocean ridges, where new lithosphere forms, or cause them to converge, with one being subducted, at deep-sea trenches.
As the hot mantle material rises and reaches the surface, it moves horizontally, cools down, and eventually sinks back into the mantle, completing the cycle and forming a convection cell. This cycle is fundamental for many geological processes, including the formation and movement of tectonic plates.
What has prokaryotic cells?
Onion root
Cows liver or
Human blood
Answer:E coli
Explanation: Which is kinda ironic considering it not even on here
A wildlife researcher wants to know how a species of fox behaves in its natural habitat. The researcher should A. observe the foxes in their environment. B. perform an experiment on the foxes. C. make a model of the foxes and their habitat. D. observe the foxes in a laboratory.
How is the world population projected to change in the next few decades? a. It is projected to level off. b. It is projected to decrease steadily. c. It is projected to increase steadily. d. It is projected to double within 5 years. Please select the best answer from the choices provided A B C D
The correct answer is option c. It is projected to increase steadily.
Explanation;
The current population of the world is estimated as more than 7.2 billion. The population is projected to be increased by 1 billion and has also estimated to cross 9.6 billion by the end of the year 2050. So, the population is increasing at a steady rate. In the total population increase, the contribution of the developing countries would be more.
The best answer is that it is projected to increase steadily, which is option C. According to the United Nations, the world population is projected to increase from 7.9 billion in 2021 to 9.7 billion in 2050 and reach 10.9 billion by the end of the century.
What is the population of the world?The world population is projected to increase steadily in the next few decades due to a combination of factors such as continued improvements in healthcare, increasing life expectancy, and high fertility rates in some parts of the world. According to the United Nations, the current global population is around 7.9 billion people, and it is expected to reach 9.7 billion by 2050 and 10.9 billion by the end of the century.
Hence, the best answer is that it is projected to increase steadily, which is option C. According to the United Nations, the world population is projected to increase from 7.9 billion in 2021 to 9.7 billion in 2050 and reach 10.9 billion by the end of the century.
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What is the name for the average time needed for half the nuclei in a sample of a radioactive substance to undergo radioactive decay?
A. half-life
B. half-year
C. half-death
D. half-month
Which of the following is FALSE about protein molecules?
A.Their function is a result of their shape and folding.
B.Proteins are made up of strands of glucose and joined together in specific sequences.
C.Protein molecules perform many different functions in the body.
D.The order of the amino acids in the protein is important and helps determine its eventual function.
Answer:
B.Proteins are made up of strands of glucose and joined together in specific sequences.
Explanation:
Proteins are made up of amino acids. An amino acid consists of an alpha carbon connected to an amino group (NH2) and a carboxyl (COOH) group. It also has a side chain 'R' which defines its many properties.
Amino acids link to each other via peptide bonds to form a protein. Two amino acids form peptide bond when amino group from one amino acid forms bond with carboxyl group of another amino acid and a water molecule is released in the process. This reaction is called as condensation or dehydration reaction.
Eventually the function and properties of a protein are determined by the amino acids in it and the way the protein has folded and taken a specific shape. Hence, the statement that proteins are made up of strands of glucose is false.
Which of these experiments would make use of qualitative data?
A study of different surfaces to compare ability to repel water
A study of different shapes to compare rolling friction values
A study on the effects of sunlight on the growth rate of plants
A study on the change in freezing point of water when salt is added
I believe that the correct answer is the first answer: A study of different surfaces to compare ability to repel water
The crust and the upper layer of the mantle together make up a zone of rigid, brittle rock called_______?
which is not true of mitosis??
Which choice is an example of an organism? A. the stripes on a tiger B. a bee hive C. an apple seed D. a hickory tree
Read the following selection from "A Retrieved Reformation" and answer the question that follows:
Pulling out from the wall a folding-bed, Jimmy slid back a panel in the wall and dragged out a dust-covered suit-case. He opened this and gazed fondly at the finest set of burglar's tools in the East...
...In half an hour Jimmy went down stairs and through the cafe. He was now dressed in tasteful and well-fitting clothes, and carried his dusted and cleaned suit-case in his hand.
"Got anything on?" asked Mike Dolan, genially.
"Me?" said Jimmy, in a puzzled tone. "I don't understand. I'm representing the New York Amalgamated Short Snap Biscuit Cracker and Frazzled Wheat Company."
What does this selection suggest Jimmy's next step will be? (5 points)
He will become a shoe salesman.
He will sell crackers to Mike.
He will go into business with Mike.
He will go back to his criminal ways.
Materials generally become warmer when light is
Materials warm up when light hits them due to energy transfer. The light energy is absorbed by the material and transformed into heat energy, similar to how sunlight warms the earth or a car's interior.
Explanation:Materials typically get warmer when light is shined onto them due to a process called energy transfer. Light carries energy, which is absorbed by the material's atoms and converted into heat. This is similar to how sunlight warms the earth.
For instance, when sunlight hits a car's windshield, the car interior heats up. This is because the light energy is absorbed by the car's interior surfaces and transformed into heat energy.
This principle is also used in solar panels, where light energy is transformed into electrical energy. The warmth you feel when light hits an object is an indicator of this energy transformation.
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what is a type of tissue that both plant and animals have??
A.nerve
B.ground
C.protective
D.connective
What do plants need to make their own food? Check all that apply.
1.water
2.nectar
3.carbon dioxide
4.oxygen
5.energy
Answer:
water- carbon dioxide- and energy
Explanation:just did the question
During the rock cycle, _____ follows erosion
A) burial
B) deposition
C) igneous rocks
D) crystallization
B) deposition is the correct answer
1
Why do people add bacteria to some foods, but kill bacteria in other foods?
A.
Not all people like the flavor of bacteria.
B.
All bacteria are safe, but they make food taste bad.
C.
Bacteria always make people sick.
D.
Different bacteria may be helpful or harmful.
Answer: D) Different bacteria may be helpful or harmful.
Explanation: Took The K12 Quiz
How did Robert Whittaker change classification?
Answer:
D
Explanation:
Rabbits have overrun a community garden and are eating everything in it. Which of the following would be the
A) Hawks
B) Poison
C) Traps
D) Hunting
Cells have blank of enzymes to act as biological
Cells contain numerous enzymes acting as biological catalysts to speed up essential biochemical reactions. These enzymes interact with specific substrates, and their activity is crucial for sustaining life, exemplified by the health issues arising from enzyme deficiencies in conditions like Sanfilippo Syndrome type B.
Explanation:Cells have a plethora of enzymes to act as biological catalysts. Enzymes are essential proteins in cells that catalyze biochemical reactions by lowering the activation energy required for the reactions to proceed. They are not consumed in the reaction, hence they can be used repeatedly. Substrates are the specific molecules that enzymes act upon, and each enzyme is specific to its substrate. For instance, the enzyme urease catalyzes the reaction involving the substrate urea. Without these biological catalysts, many necessary reactions would not occur rapidly enough to sustain life. An example of this is individuals with Sanfilippo Syndrome type B, who lack a particular enzyme, leading to cellular damage and severe health consequences.
Furthermore, enzymes can be classified according to their function: catabolic enzymes break down substrates, anabolic enzymes build complex molecules from substrates, and catalytic enzymes affect the rate of the reaction. All enzymes serve to increase the rate of chemical reactions, making them vital organic catalysts in living organisms.
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A science student makes the following statement. A raccoon may live longer when it eats only vegetables. What is the student doing
Lucia is given a picture of several cells. Her task is to identify the cells as plant or animal cells. How can she pinpoint the cells that are plant cells? A) She should look for a cell membrane surrounding the cell. B) She should look for cytoplasm that is filled with organelles C) She should look for a large nucleus in the center of the cells. D) She should look for ovals full of green dots called chloroplasts.
Answer:
d
Explanation:
She should look for ovals full of green dots called chloroplasts.
The correct option is She should look for ovals full of green dots called chloroplasts.
What is cell?
Cell is the basic unit of life. There are two types of cell. Plant cell and animal cell. Plant cell is the basic unit of kingdom plantae.
The fundamental unit of life in species belonging to the kingdom Plantae is the cell. They are eukaryotic cells, which have specialized components called organelles and a real nucleus that performs several duties.
Chloroplasts are unique organelles found in plant cells that use photosynthesis to produce carbohydrates. They also have a cell wall, which serves as support for the structure.
Therefore, The correct option is She should look for ovals full of green dots called chloroplasts.
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Which two systems are primarily responsible for maintaining Homeostasis during exercise? Explain how each of the system helps the body maintain Homeostasis.
(PLEASE HELPPP IT'S DUE TODAY AND IM STILL STRUGGLING T T)
Proteins, carbohydrates, and nucleic acids are all polymers. What repeating subunit is each made of?
Amino acids. These class of compounds are considered the building blocks of most organisms, and around 500 of these are known and indentified. All proteins, carbohydrates, and nucleic acids are polymers ("many units") and each unit is an amino acid.
Answer:
Most large biological molecules are polymers, long chains made up of repeating molecular subunits, or building blocks, called monomers. ... Carbohydrates, nucleic acids, and proteins are often found as long polymers in nature.
Enzymes are proteins. What would happen to the enzymes of your body if your body temperature started to rise to an abnormally high degree?
A.The enzymes would become denatured and their active sites would lose their shape causing them not to work.
B.The enzymes' substrates would become changed in shape and no longer fit the active sites of the enzyme.
C.Nothing, the enzymes would be fine because they are very stable molecules.
D.The enzyme would become larger than the substrate but would still continue to work, just not as well
Sex-linked recessive disorders are most often passed from mother to sons
If an organism is composed of only one cell, it __________.
performs all of the functions
is specialized
does not have any functions
cannot survive on its own
How many cells in a unicellular organism function to reproduce
A) 0
B) 1
C) 10
D) 100
Plz help
How many protons are in an element with an atomic number of 8 and a mass number of 18
In the United States, tornadoes generally occur because of the
Answer:
cool and warm air masses
Explanation:
the latin word porus means passage. how does this meaning relate to the pores of the skin
The word porous is related to the pores of skin. Skin which has small openings in the skin are called as porous skin.
What is Porous skin?Pores are the small openings which are present at the top of hair follicles that covers the entire body surface. The pores release sebum, the body’s natural oil, to naturally moisturize the skin to help keep it supple and smooth. Although the large pores on the skin can be frustrating, pores are necessary for the maintaining healthy skin.
Usually, genetics determine the larger pores. However, the oily skin, sun damage and aging can be other factors which make the body pores look bigger.
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What is one difference between a cell wall and a cell membrane?
A) Cell walls do not connect cell to cell. Cell membranes connect cell to cell.
B) Cell walls contain vesicles. Cell membranes contain plasmids.
C) Only plant cells have cell walls. Only animals cells have cell membranes.
D) The cell wall is a rigid structure. The cell membrane is flexible.