FORESTRY
SOIL SCIENCE
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
humus
|
|
|
bedrock
|
|
|
topsoil
|
|
|
subsoil
|
Detailed explanation-1: -Earthworms are especially important because they dig through the soil and give the roots of plants places to grow, and make spaces for water and air to get into the soil. Subsoil. The topsoil is relatively thin but it has most of the soil’s nutrients. Just below the topsoil layer is the subsoil layer.
Detailed explanation-2: -Humus is dark, organic material that forms in soil when plant and animal matter decays. When plants drop leaves, twigs, and other material to the ground, it piles up. This material is called leaf litter. When animals die, their remains add to the litter. Over time, all this litter decomposes.
Detailed explanation-3: -A-Horizon, the topmost layer of the soil profile is soft, porous, rich in humus and minerals. It is in this layer that most of the plants grow.