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WilkinsSec5

Section 5.1-5.3

QuestionAnswer
Mechanical Weathering Physcial processes that break down rock
Chemical weathering process that changes COMPOSITION of rock.
Frost wedging Mechanical process; water freezes and expands and breaks rocks
Unloading subsection of mechanical weathering
Biological activity break down of rocks by living things
most important chemical agent water
When granite undergoes chemical weathering what 2 minerals form quartz and feldspar
2 factors that affect rate of weathering rock characteristics and climate
spheroidal weathering corners or edges of rock become rounded
regolith layer of rock and mineral fragments
soil supports the growth of plants
4 major componets of soil composition mineral matter, humus, water air
humus decayed organisms
45% soil composition is mineral matter
factors in soil formation parent material, climate, time, slope
Greatest effect on soil formation Climate
residual soil does not _________ move
soil that has been moved is called transported
longer time =_________ thicker soil
poorly devloped soils are located on _________ steep slopes
topsoil Horizon A
subsoil Horizon B
Partially weathered parent material Horizon C
3 types of soil pedocal, pedalfer, laterite
tropical climate=________ soil laterite
grasslands=________soil pedocal
forest areas = _________ soil pedalfer
rock and soil move downslope due to gravity mass movements
4 causes of mass movements saturation of material, oversteeped slopes, removal of vegetation, earthquakes
5 types of mass movements rockfalls, slides, flows, creeps, slumps
slowest mass movement creep
broken rock fragments at bottom of cliff talus
Created by: lmwilkins1913
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