Soil

What is the solid layer of rock beneath the soil called?

• subsoil

• bedrock

• gravel

• horizon B

The layers or horizons make up which soil quality?

• pH

• permeability

• composition

• profile

The size and number of open spaces in soil that let water flow through determine which soil quality?

• pH

• profile

• composition

• permeability

What determines the texture name of soil?

• age of the soil

• amount of water

• slope of the land

• percent of sand, silt, clay in the soil sample

What is the decayed organic material in soil called?

• humus

• litter

• silt

• clay

Rate of drainage is used to measure what soil property?

• particle size

• pH

• soil profile

• permeability

Which pH range do most plants grow best in?

• 7-10

• 5-7

• 10-12

• 2-4

Why is soil a valuable resource?

• it is rich in decomposers

• it has all three soil horizons

• it is important to all living things on land

• it contains sand and gravel

What can be added to soil to alter the pH to help make the soil's nutrients more accessible?

• clay

• lime

• air

• water

Which soil particle is the largest?

• silt

• clay

• sand

• gravel