Weathering and soil formation

Decayed organic matter is...

• Hummus
• Humus
• Himalayas
• Hummers

Does the vertical cross-section of soil in the picture show a soil profile or a soil horizon?

• Soil Profile
• Soil Horizon

In which answer choice are the soil particles arranged in order from LARGEST to SMALLEST?

• Silt, sand, clay
• Silt, clay, sand
• Clay, silt, sand
• Sand, silt, clay

The picture shows desert soil. This forms in dry regions, so which of the following characteristics seems to fit best? The soil is...

• Deep and contains much organic matter
• Deep and contains little organic matter
• Shallow and contains much organic matter
• Shallow and contains little organic matter

What is the movement of soil from one place to another?

• weathering
• deposition
• discharge
• erosion

Humus is.....

• the dead parts of plants and animals in soil.
• A food we eat with pretzels.
• The tiny particles inside of soil
• The roots that come off of a plant and live in soil.

How does freezing water cause the weathering of rocks?  The freezing water—

• keeps the rocks in place
• makes the rocks last longer
• expands cracks and breaks rocks
• causes rocks to fall in landslides

The diagrams  shows a natural process that weathers rock.
 Which statement best explains why this process results in weathering?

• frozen water acts as a solute
• water expands when it freezes
• the mass of water increases when it freezes
• frozen water dissolves most types of rock

How does wind abrasion work?

• Sediment is blown off a surface from wind.
• Wind-blown sediment strikes a surface.
• Wind blows large chunks of rock off a surface.
• Sediment falls off of a surface on its own.

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.