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Weathering & Erosion Vocab
Chapter 8 Vocab
28
Science
Not Applicable
02/28/2005

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Term
weathering
Definition
natural process that causes rocks to break down
Term
2 main causes of chemical weathering
Definition
natural acids & oxidation
Term
4 agents of erosion
Definition
gravity, ice, wind, water
Term
creep
Definition
sediments move downhill slowly
Term
ice
Definition
forms continental & valley glaciers
Term
wind
Definition
blows small particles from Earth's suface
Term
deflation
Definition
erosion of land by wind; can lower the land's surface by several meters
Term
mechanical weathering
Definition
breaks rocks into smaller pieces without changing them chemically
Term
soil
Definition
mixture of weathered rocks, organic matter, water, and air that supports the growth of plant life
Term
gravity
Definition
force that pulls every object toward every other object; pulls everything on Earth toward its center
Term
slump
Definition
rock or sediment moves downhill along a curved slope
Term
glacial erosion
Definition
occurs as glaciers remove loose pieces of rock or as dragged rock scratches rock underneath the glacier
Term
abrasion
Definition
forms pits in rocks or polishes surfaces smooth as sediments are blown by strong winds
Term
runoff
Definition
water flowing on Earth's surface causes erosion
Term
2 main causes of mechanical weathering
Definition
ice wedging & plants/animals
Term
five factors that affect soil formation
Definition
parent rock, slope of the land, climate, time, organisms
Term
mass movement
Definition
gravity pulls rock or sediment down slopes
Term
rock slide
Definition
rock layers break loose & slide downhill
Term
cirques
Definition
valley glaciers remove rock from mountain tops forming large bowls
Term
dunes
Definition
can form as the wind is slowed as it blows around irregular features such as rock or vegetation and deposits the sediment it carried
Term
sheet flow
Definition
when water flows downhill as a thin sheet often carrying loose sediment grains
Term
chemical weathering
Definition
when the chemical composition of a rock changes
Term
erosion
Definition
wearing away and removal of rock, occurs because of gravity, ice, wind & water
Term
4 types of mass movements
Definition
creep, slump, rock slide, mudflows
Term
mudflows
Definition
mass of wet sediment that flows downhill over the ground surface
Term
till
Definition
a mixture of different sized particles ranging from clay to boulders
Term
loess
Definition
fine silt
Term
rill & gullies
Definition
channels cut into Earth's surface and are formed as runoff carrying sediments along
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