Flashcards in Weathering and Soil Deck (28):
What is weathering?
the break up of rock due to exposure to process at or near the earth's surface
What are the two types of weathering?
mechanicAL and chemical
How do mechanical and chemical weathering differ?
mechanical-breaks without any change in composition
Chemical-minerals are changed into new mineral
What are the 4 ways that mechanical weathering occurs?
Ice and water-frost wedging
Abrasion-the wearing away of rock material by grinding action
Plants and animals- roots and claws digging
upward expansion- exfoliation
What are the 3 ways that chemical weathering occurs?
What kind of soil formed in the place where it was found. It matches the bedrock underneath it
What soil was moved to a new area by erosion. it does not match the bedrock beneath it
What is a soil profile?
a cross section of the soil from the surface down
In what order to the horizons form?
What is the A Horizion?
Gray to black
Contains humus-decaying organisms
What is the B Horizon?
clay and other minerals leach (wash) down from above
What is the C Horizon?
Partly weathered bredrock
What is D Bedrock?
What factors determine how fast weathering will occur?
What three factors determine how fast weathering will occur?
What three factors determine the composition of soil?
plants and animals
What forms in areas of little or no rainfall, generally sandy
What kind of soil forms in areas with enough rain to support grass; fertile for farming
What type of soil forms in very wet, warm regions. Soil profiles are deep
What type of soil forms in cold climates. Slow weathering results in shallow profiles
What type of soil forms in areas with enough rainfall to support heavy tree growth
What is found in Sterling areas?
For farms to be productive they must practice what to reduce soil erosion?
Planting trees along the edge of a field to reduce wind erosion creates a what?
What is when farmers plow their fields perpendicular to the slope?
Flattening a slop into ________ is used in cultivating rice
When farmers plant 2 different crops in one field to cover up bare soil, it is called _________