Soil

Minerals, weathered rocks, air, water, bacteria, plants, animals and bits of decayed plants and animals all make up ________________________.

• rock

• soil

• humus

• roots

Bits of decayed plants and animals give nutrients to plants. They are called _______________________.

• rocks

• soil

• humus

• roots

A plant’s _________________________ take in water and hold the soil in place so it doesn’t erode.

• rocks

• soil

• humus

• roots

The layer where there is a lot of humus is called __________________________.

• topsoil

• subsoil

• parent material

• bedrock

This layer is as far down as plant roots go and has less humus than the layer above it. It is called the ________________________.

• topsoil

• subsoil

• parent material

• bedrock

The layer of solid rock which has not had any weathering is called _______________________.

• topsoil

• subsoil

• parent material

• bedrock

Soils with thick layers and lots of humus are good for ___________________________.

• making rocks

• growing plants

• erosion

• all of the above

Soils are different colors because they have different minerals and amounts of ______________________.

• animals

• plants

• humus

• trees

Soil that is made up of a mixture of sand, silt and clay is called ______________________.

• sand

• silt

• clay

• loam

______________________ has a lighter color than topsoil.

• topsoil

• subsoil

• parent material

• bedrock