Soil and Carbon cycle

Decayed organic material in soil is called______.

• Litter
• Silt
• Humus
• Clay

Topsoil which contains the HUMUS is the soil layer best for growing plants.

• True
• False

There is an unlimited supply of fertile soil.

• True
• False

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

• True
• False

What type of soil contains the largest particles of rock?

• silty
• bedrock
• sandy
• clay

To grow, plants need water, light, and ______ from the soil.

• nutrients
• bedrock
• worms
• roots

What is the best type of soil for plants? It is made up of the three soil types.

• plants
• loam
• humus
• dirt

Soil is made ________ in nature.

• quickly
• slowly
• higher
• lower

Water gets into the cracks of rock and freezes, causing the rock to break.  What is this an example of?

• erosion
• weathering

Soil is made of

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