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Weathering

weathering information for BSC

QuestionAnswer
frost wedging process where freezing and thawing eventually breaks water apart.
salt crystal growth salt crystals grow in rocky shore lines and arid regions, as the water evaporate the salt crystals form, pushing apart the surrounding rock
talus slopes large piles at bases of steep rocky cliffs
exfoliation domes large, dome-shaped structure, usually composed of granite, formed by sheeting
abrasion not in the chapter
oxidation Fe2+ + H202 + 2H+ = 2Fe3+ +2H20 examples: rust
dissolution co2 + H20 = H2CO3 dissolve in water
Hydrolysis Mg2SiO4 +4H+ + 4OH- = 2Mg2+ +4OH- + H4SiO4
hydration Mg2+(g) + H20 = Mg2+(aq)
name two characteristics that effect the rate of weathering 1. rock characteristics- mineral composition, solubility, and physical features 2. climate- mechanical weathering frost freeze cycle, chemical weathering warm temperatures and abundant moisture
regolith layer of rock and mineral fragments produced by weathering
soil combination of mineral and organic matter, water and air four components always are present to some extent 1/4 disintegrated and decomposed rock 1/4 humus decay remains animal and plant 1/2 pore space air and water circulate
loam no single particle predominates best suited for supporting plant life because best moisture and nutrient storage
horizons vertical zones in soil
O-horizon largely organic material upper part plant litter, lower part humus, microscopic life.
A- horizon mineral matter mixed with some humus
top soil O and A make up top soil
E - horizon light-colored, layer little organic finer particles carried away by water
Created by: 35904657
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