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Layers of the Soil
Components of Soil
Weathering & Erosion
Soil Structure
Other
100

This is the very top layer of soil.

What is humus.

100
This is decayed matter in soil. It adds nutruents to the soil and is located in the topsoil.
What is humus.
100
Erosion is when rocks and soil are moved by what two things?
What is wind and water.
100

These makeup soil.

What is organic matter, minerals, air, and water?

100

What does composting create?

Soil

200
This is the bottom layer of soil.
What is bedrock.
200
This is made up of small grains of worn-down rock, has few nutruents, and does not hold water well.
What is sand.
200
Weathering occurs over a short amount of time or long?
What is long amount of time.
200

These are mineral patricals

What are sand, silt and clay?

200
Why should soil be conserved and not wasted?
Because it takes a long time to form.
300

This is the layer below topsoil.

What is subsoil.

300
This contains tiny particles of soil that hold water well and provides nutrients.
What is clay.
300
What is the term for when weather, water, and living organisms help break down rocks and create soil?
What is weathering.
300

Is soil is made quickly or over a long period of time?

Over a long period of time

300
These two layers are formed over a long period of time by the action of water.
What is subsoil and bedrock.
400

These are the four layers of soil?

What is topsoil, humus, subsoil, bedrock.

400
This is made up of very small broken pieces of rock. Its particles are larger than clay and smaller than sand.
What is silt.
400

What is soil erosion?

the topsoil is removed by wind and water

400

Name two living things found in soil?

answers will vary

400

Name one positive and one negative to additives in soil?

Positives- plants grow larger

Negatives:  

500

Soil layers are called?

Horizons

500

This is the best type of soil to grow plants

Loam or silt

500

How can we stop soil erosion?

grow more plants

grow trees 

grow crops in rotation 

add more organic matter

500

Name two non-living things found in soil

answers will vary

500

What causes soil erosion?

poor protection from wind and rain

steep hills

removing plants

open fields