The layer of soil that contains the most organic material is called the -------- horizon

All of the following cause mechanical weathering EXCEPT_____

Litter often covers the__ horizon

Chemical weathering is more rapid in a _____climate

Mechanical weathering is more rapid in a ______ climate

The organic matter in humus is made of ____

The rate of weathering depends on the area's

The rock mineral fragment is soil came from rock that has been__________

On steep slope and the mountains,______helps reduce erosion by creating level ares for crops

The difference between mechanic and chemical weathering is ___________

soils in ______ contain little organic mater

plant cannot grow without____________

________________ regions are especially vulnerabel to erosion because their soils are useful to farmer for only a few years before their nutrients are gone

The mass of clay silt sand and boulders that covers much of the united states was deposited by_______

ice wedging is brought about by _____________

minerals found in the B horizon were dissolved in water and carried there by a process

oxidation occurs when materials contanining ____ are expoosed to oxygen and water

The B horizon is

plants don't grow well when _____ has been lost

_____________ is a factor that affects soil development

the ___ horizon has smaller rock and mineral particles than the other

Below the C horizon is _____

Mechanical weathering

Chemical weathering

In areas where freezing and thawing occur frequently rock weather rapidly because of the _____ of freezing water

______ turns and loosens soil improving it for crops but leves it vulnerable to erosion