Soils

When plants, animals, and other organisms die, they break down and become part of the soil. What is this part of the soil called?

• sand
• silt
• clay
• humus

Tags

NGSS.MS-LS2-3

What is the layer of soil that contains humus, leaf litter, and other organic matter?

• O - Organic
• A - Topsoil
• B - Subsoil
• R - Bedrock

Tags

NGSS.MS-LS2-3

Which layer is the bottom of the soil profile?

• C - Partially Weathered Parent Material
• D - Separated rock
• R - Bedrock
• A - Topsoil

Layers of soil are also known as:

• Soil Profiles
• Soil Horizons
• Soil sheets
• Soil cores

Tags

NGSS.MS-ESS2-1

In which layer of the soil profile contains the MOST humus?

• Layer 1 (A)
• Layer 2 (B)
• Layer 3 (C)
• Layer 4 (R)

Tags

NGSS.MS-LS2-3

In which layer of the soil profile contains a solid layer of rock?

• Layer 1 (A)
• Layer 2 (B)
• Layer 3 (C)
• Layer 4 (R)

Tags

NGSS.MS-ESS2-1

What is soil made of?

• weathered rock

• humus

• weathered rock and humus

• dirt

What is weathering?

• when it is raining

• when rocks break down into smaller pieces

• when plants and animals decay

Physical and chemical weathering are both processes that

• move rocks
• break down rocks
• change rocks in to new materials
• dissolve rocks

Which earth materials have the smallest particle size?

• clay

• sand

• silt