Earth Science Chapter 7 Review- Weathering, Erosion, and Soil

Topsoil has the MOST humus because

• it has lots of sand
• a.  most living things die on or near the surface forming humus.
• a.  it is mostly weathered rock.

What is the difference between weathering and erosion?

• a.  erosion is the support and nutrients of plant growth; weathering breaks down rocks to create soil
• a.  erosion is the movement of sediment and rocks to new places; weathering breaks down rocks to create soil
• a.  erosion stops rocks from moving to new places; weathering puts rocks together to create soil

Rain washing away soil from a hillside is an example of what?

• Weathering

• Erosion

• Deposition

• Compaction

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Waves dropping sand on the beach is an example of what?

• Weathering

• Erosion

• Deposition

• Compaction

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Caves being formed by acid rain dissolving underground limestone are examples of what?

• Chemical Weathering

• Erosion

• Deposition

• Mechanical Weathering

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Water getting into cracks, freezing, and breaking the rocks or pavement apart is an examples of what?

• Mechanical Weathering

• Erosion

• Deposition

• Chemical Weathering

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What is the major cause of weathering and erosion?

• wind
• ice
• glaciers
• moving water

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What is mechanical weathering?

• Process through which rocks are physically broken into smaller pieces.
• Rocks are broken down through chemical changes.
• Rocks are worn away from acid in plant roots.
• Rocks broken down by machinery.

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In which type of climate would weathering happen the fastest to a rock?

• wet and warm
• dry and cold
• wet and cold
• dry and warm

If the same type of rock were placed in a rainforest, desert, a forest in Tennessee, and the North Pole, in which area would the rock weather the fastest?

• rainforest
• desert
• North Pole
• forest in Tennessee

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