Soil-3rd Grade

Front

What is bedrock?

Back

The hardest and lowest layer of soil.

Front

What is humus?

Back

The decayed remains of plants and animals.

Front

The more humus there is in the soil, the __________________ it is.

Back

darker and richer

Front

Which layer of soil do plants usually grow in? Options: topsoil, subsoil, bedrock

Back

topsoil

Front

What type of soil is made from a mixture of sand, silt, and clay?

Back

loam

Front

Soils can be all different colors.

Back

True

Front

When soil is being formed, the first step is: weathering of rock, mixing with humus, mixing with air and water

Back

weathering of rock

Front

Which layer of soil is weathered into small pieces to form soil? Options: bedrock, subsoil, topsoil

Back

bedrock

Front

Soil takes many ________ to form.

Back

years

Front

Soil formation is considered a _________________ change to Earth's surface.

Back

slow