The Surface of the Erath

Where can you find soil?

• Only on dry land
• Only on the bottom of oceans and lakes
• Covering all earth's surface
• Covering earth's surface only at low elevation

Soil formation begins with the weathering of_______.

• Humas
• Subsoil
• Litter
• Rock

The MAIN  thing Decomposers do for the the soil is the following:

• Store moisture
• Burrow deep in the soil
• Make space for air and water
• Break down and digest dead organisms

In which horizon is most of the HUMUS?

• Horizon A
• Horizon B
• Horizon C
• Horizon D or R

Which horizon is made up of partially weathered rocks?

• Horizon A
• Horizon B
• Horizon C
• Horizon D or R

Soil's one of the Earth’s most valuable resources. Everything on Earth depends on soil somehow.

• True
• False

Soil layers are called horizons because...

• The layers are all different
• The layers are vertical
• The layers are horizontal
• The layers are above one another

Soil is made of

• weathered rocks and minerals
• dead plants and animals
• air and water
• all of the above

Which layer of soil is on the bottom?

• topsoil
• subsoil
• bedrock
• bottomsoil

Which of the following is NOT one of the three layers of soil?

• topsoil
• undersoil
• subsoil
• bedrock