Intro to Soil

The O horizon is made what of ______.

• layer of loss

• organic matter

• mineral layer

• layer of gain

A horizons is known as _______.

• layer of gain

• subsoil

• top soil

• mineral layer

Horizon E is between what two other horizons?

• O and A

• A and B

• B and C

• C and Bedrock

Horizon B is known as ______.

• top soil

• subsoil

• bedrock

• mineral layer

C horizon is known as ______.

• top soil

• subsoil

• mineral layer

• bedrock

What is horizon is under horizon C?

• A

• B

• E

• Bedrock

What essential nutrient do plants NOT get from photosynthesis?

• carbon

• oxygen

• nitrogen

• hydrogen

What is the cultivation of plants in water?

• greenhouse

• hydroponics

• nitrification

The PH scale is _____.

• 1-7

• 1-14

• 2-13

• -1 - -14

Primary nutrients are also called _____.

• micronutrients

• macronutrients

• secondary