Which component is not formed by the weathering of rocks?
A. pebbles
B. rocks
C. clay
D. humus
I think it is humus because I think humus only has dead plants and animals.
correct. Good work
Yes, you're correct! Humus is formed from the decay and decomposition of organic matter such as dead plants and animals. It is a dark, organic-rich component found in soil that provides nutrients and improves soil fertility.
To arrive at this answer, we can analyze the four options given and eliminate the ones that are formed from weathering of rocks.
Pebbles and rocks, option A and B, are both formed from the weathering and erosion of larger rocks over time. With continuous exposure to physical and chemical weathering processes like wind, water, and temperature changes, rocks break down into smaller fragments such as pebbles.
Clay, option C, is also formed from the weathering of rocks. It is composed of tiny mineral particles that result from the breakdown of larger rocks. These particles are transported and deposited by water and accumulate over time.
Therefore, the only remaining option is humus, option D, as it is formed solely from the decomposition of organic matter in the soil.