B. chemical weathering
C. biological weathering
D.all of these
A
This is because it freeze-thaw causes the rock to break down, mechanically.
Explanation:
When water precipitates, it enters the crevices of the rocks. When the water temperatures go below 4 degrees and even turn to ice, the water expands. This causes the supercooled water/ice to push against the walls of the crevices putting great stress on the rock hence increasing the size of the crevices. When water temperature rises the water contracts and stops putting stress on the rock also because it will be occupying less space in the crevices (partly because the crevice has also increased in size from the initial stress). When the crevice again fills with water (and note that this time it will fill with more water because the crevice is bigger), and the water cools to ice, it expands and puts stress, again, on the crevice growing it even larger. When this freeze-thaw continues over time, it ultimately will lead to the rock splitting apart along the crevice.
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Answer:
physical weathering
Explanation:
:)
Transport materials within the cell are called Motor proteins.
Materials within a cell are primarily transported by motor proteins. These specialized proteins move along the cellular cytoskeleton, a network of protein filaments including microtubules and microfilaments, serving as tracks for intracellular transport.
Two prominent motor proteins involved in intracellular transport are dynein and kinesin.
Dynein typically moves cargo towards the minus end of microtubules, while kinesin moves it towards the plus end.
They carry various cellular components, such as organelles, vesicles, and proteins, to precise locations within the cell.
This intracellular transport is crucial for many cellular processes, including protein trafficking, organelle positioning, and cell division.
It ensures that the cell's components and materials are delivered to the right place at the right time, allowing for proper cell function and maintenance.
In summary, Motor proteins transport materials within the cell.
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Complete questions:-
Transport materials within the cell are called?
Answer:
(1) Red Blood Cell
(2) Enzymes
Explanation:
(1) Oxygenated Red Blood cells transport oxygen from the lungs through the body using the arteries as a channel of movement to all organs.
(2) Enzymes are proteins that catalyze chemical reaction in the digestion of food so as to break food down into a form which can be absorbed by the body.
Topsoil is the upper, outermost layer of soil, usually the top 2 inches to 8 inches. It has the highest concentration of organic matter and microorganisms and is where most of the Earth's biological soil activity occurs. Four elements constitute the composition of soil.
Animals burrowing and plant roots growing down into the soil create the pores in the soil for the air and the water.
The organic matter in the soil comes from the decay of dead plants and animals. Earthworms, bacteria and fungi are just a few of the organisms that live in the soil, feed on the organic matter and decay or recycle plant nutrients. All of the organisms that live in the soil are such an important part of the continuous, natural process of decomposing organic materials and preparing the soil for future plant growth
The correct answer is option D, that is, the four electrons in its outer shell.
Carbon is a very common constituent of matter as it can combine with other elements and with itself. It can produce a huge array of compounds, varying in size from just a few atoms to thousands of atoms.
Carbon is a nonmetal in the periodic table group 14. Carbon has four valence electrons, the valence electrons refer to the electrons in the outer energy level of an atom, which takes part in chemical bonds.