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What happen when rocks are weather?
They break down into smaller pieces.
When grain mixed with humus, what do they become?
They become soil.
What happen when plants or animals die?
They decompose into humus.
How many main layers of soil are there?
There are 3 main layers of soil: the top layer, the middle layer and the bottom layer.
Name the different things that make up soil.
Soil is a mixture of weathered rocks, humus, minerals, air, and water.
What happen when animals dig into the soil?
They move the humus down.
Guess the word
dig
the part of soil made of dead plants or animals
humus
a very small piece of a hard thing
grain
a number of things on top of each other
pile
Most plant roots are in the top layer of soil. True or False?
TRUE
