Soil

Which type of soil is the best for growing plants?

• humus

• loam

• sand

• silt

Which type of soil has the smallest pieces of rock?

• clay

• humus

• sand

• silt

What would happen if the soil in an environment became more fertile?

• plants would grow better

• there would be more rain

• the bed-rock would get thicker

• dead plants would not decompose

Which material is a mixture of water, air, pieces of rock, and dead plants and animals?

• humus

• nutrients

• sand

• soil

Why might a farmer use soil?

• to build homes

• to grow plants for food

• to give water and light to plants

• to break down rocks into smaller pieces

The particles of rock in soil are different sizes. Which list shows rock particles in soils in order from biggest particles to the smallest particles?

• clay, sand, silt

• clay, silt, sand

• sand, silt, clay

• silt, clay, sand

Which soil type can hold the most water?

• clay

• silt

• loam

• sand

Why is soil considered a natural resource?

• plants grow in soil, and people use plants.

• plants grow best in soil called loam.

• soil contains small bits of rock and humus.

• soils forms through weathering of bedrock.

Choose ALL soil types that support plant growth.

• clay

• sand

• loam

• silt

What on Earth needs soil?

• all living things.

• water.

• air.

• nothing.