The top layer of soil is called ________.

• bedrock
• topsoil
• subsoil
• grass

This is found in the topsoil and is made of decaying plants and animals. 

• dirt
• water
• humus
• subsoil

This type of soil is sticky when wet and hard when dry. 

• clay
• silt
• sand
• gravel

This type of soil is best for plant growth. 

• rock
• sand
• loam
• clay

This type of soil is made of tiny pieces of rock. 

• sand
• clay
• humus
• loam

This type of soil is carried by water and left as sediment. 

• bedrock
• loam
• silt
• clay

The four types of soil are _____. 

• humus, gravel, pebbles, sand
• sand, silt, clay, loam
• sand, rock, pebbles, granite
• sand, clay, bedrock, topsoil

What physical property of soil determines if it retains water?

• color
• particle size
• texture
• weight

No water stays in this when poured through. 

• loam
• clay
• gravel
• topsoil

Loam is a mixture of clay, silt, and sand. 

• True
• False