4th Grade Soil Preview

What is not a way a rock is broken down and weathered

• freezing and thawing
• plant roots
• heat expansion
• carried away by wind

What forms after a rock has been weathered over many years?

• streams
• lakes
• soil
• valleys

A piece of rock from a mountaintop is found on a beach near an ocean.  What is this an example of?

• soil
• weathering
• ice wedging
• erosion

What is soil mostly composed of?

• mineral matter
• air
• organic matter
• water

Where does organic matter in the soil come from?

• air
• water
• living things

Which layer of soil is most important for plant growth?

• topsoil
• subsoil
• bedrock

What gives topsoil its dark color?

• rock particles
• more water
• larger rock pieces
• decaying living things

Which of the following lists the 3 types of soil?

• sand, topsoil, parent material
• sand, silt, clay
• topsoil, subsoil, bedrock

Which type of soil holds water the best?

• sand
• silt
• clay
• bedrock

Which type of soil does water flow through quickly?

• sand
• silt
• clay
• bedrock