Show:
Soil Layers
Helping & Hurting Soil
Mechanical Weathering
Chemical Weathering
A mix of everything!
100
What is the top layer of soil called?
Humus
100
A worm carrying soil from Horizon A to Horizon B is known as what process?
Mixing the Soil
100
What type of mechanical weathering can create potholes in the road?
Ice Weding
100
True or False: Plants can cause chemical weathering
True
100
What is not a way farmers can conserve soil? Contour Plowing Straight Row Plowing Conservation Plowing Crop Rotation
Straight Row Plowing
200
What is the bottom layer of soil called?
Bedrock
200
What is an example of a soil decomposer?
Mushrooms
200
True or False: Tree Roots can break apart rocks.
True
200
What is the most common acid that causes chemical weathering?
Carbon Dioxide
200
What in rocks determines how quickly they will weather?
Minerals
300
What are soil layers called?
Horizons
300
What type of soil damage can cause a Dust Bowl?
Loss of Topsoil
300
What is ice wedging? How can it cause a mechanical change in rocks?
Ice wedging is when water gets into rocks, freezes, and breaks the rock apart. Mechanical changes are changes in the rock's size and shape. Ice wedging change the rock's shape by breaking apart and it can make it smaller.
300
What are most chemical changes in rocks caused by?
Water
300
True or false: Water is stronger than rock and can break rocks into smaller pieces.
True!
400
What of the following is not contained in topsoil? Humus Clay Bedrock Minerals
Bedrock
400
To conserve soil, farmers can plant their crops in a circle instead of straight rows. What is this known as?
Contour Plowing
400
What does heat cause rocks to do?
Expand (get larger)
400
Write an example of something that can change color as a result of acid or oxygen chemical weathering.
Pennies, Statue of Liberty
400
What is the difference between mechanical and chemical weathering?
Mechanical weathering is the physical changes in rocks, such as size and shape. An example is ice wedging. Chemical weathering is a change in the chemical makeup. An example is when oxygen reacts with the minerals in rocks and changes their color.
500
What are the 5 layers of soil in order from top to bottom?
Humus Topsoil Subsoil Parent Material Bedrock
500
What is it called when farmers alternate planting crops that require many soil nutrients with ones that do not?
Crop Rotation
500
What are the 3 main types of mechanical weathering?
Temperature Change Root Action Ice Wedging
500
What are the three types of chemical weathering?
Oxygen, Acid, Water
500
How does weathering play a role in soil?
Weathering is the breakdown of rocks. When rocks are so broken down, they become sediments. Soil mixers can mix the sediments into the different layers of soil. Bedrock also weathers to become Parent Material (3rd layer of soil).