Weathering & Soils

If pieces of a rock flake off due to extreme temperature differences, it would be?

• erosion
• mechanical weathering
• chemical weathering
• transportation

Chemical weathering:

• is unrelated to mechanical weathering
• can go faster when there has been mechanical weathering
• can go slower when there has been mechanical weathering
• none of these

If a mineral changes to a different type it has experienced 

• chemical weathering
• mechanical weathering
• erosion
• physical weathering

Minerals undergo chemical weathering because 

• they formed at different pressure and temperature
• they first undergo mechanical weathering
• they break apart by mechanical weathering
• water takes away some of their ions

Because carbon dioxide combines with water in the atmosphere

• average global temperatures are rising
• plants thrive
• the atmosphere is warmer
• rainwater is a weak acid

Topsoil is dark in color because it 

• it is very inorganic
• is full of dark rocks
• it has lots of worms
• it has a large amount of organic material

In the eastern U.S., high rainfall and deciduous forests have soils called?

• pedocal
• laterite
• pedalfers
• weathered soils

Adding organic material to soil 

• allows it to contain water and nutrients
• decreases its fertility
• increases its A horizon
• often kills existing vegetation

Farmers terrace hillsides to 

• eliminate the soil’s C horizon
• increase the types of crops they can grow
• increase the creation of soil
• reduce erosion

Soil made from the bedrock that lies beneath it  is known as

• eroded soil
• residual soil
• transported soil
• none of these