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when does mechanical weathering occur?
when physical forces break rocks into smaller and smaller pieces without changing the rock’s mineral composition.
name the three physical processes that cause mechanical weathering?
frost wedging,unloading and biological activity.
describe frost wedging?
frost weding is most common in mountains regions in the middle latitudes. here daily freezing and having often occur.
slabs of outer rock separate like the layer of an onion and breaks loose in a process called?
exfoliation
what is meant by biological activity?
the activities of organism,including plants,burrowing animals,and humans,can cause mechanical.
explain chemicals weathering?
transformation of rocks into one or more new compounds.
________ is the most important agent of chemical weathering .
water
can chemicals weathering change the physical shape of a rock?
yes
what two factors affect the rate of weathering?
characteristic and climates
give an example of a rock characteristic.
grave stones
what is regolith?
weather produces a layer of rock and minerals fragments
name 4 major components of soil.
water and air, mineral matter, organic matter
what are the most important factors in soil formation?
parent material, time, climate,organisms and slope
soil varies in composition,__________,_________,_________ and at different depths.
soil varies in composition, texture, structure, and in formation at different depths.
what are the three common types of soil?
Pedalfer,Pedocsl,and Paterite
how do human activities affect rates of erosion?
remove natural vegetation, such as family,bagging, and construction, have greatly acceverated erosion
what is mass movements?
how do geologists classify mass movements?
when does rock fall occur?
how does mudflows differ from earth flows?