Weathering and Erosion 4.1

erosion

The process by which wind, water, ice, or gravity transports soil and sediment from one location to another

weathering, erosion, deposition

act together in a cycle that wears down and builds up earth's surface

rule

as a _______ fine grained and porous rock weather faster than coarse grained and non-porous rock

Talus

broken fragments collected in huge piles of rock

physical weathering

does not change the chemical composition of the minerals that compose a rock

oxidation

oxygen in the air and water reacts with minerals and iron to form a new compound; examples water, acid, oxygen

physical weathering

the breakdown of large rocks into fragments by physical forces ( ice, rapid temperature change, and grit carried by wind or running water in)

exfoliation

the breaking or peeling away of rock layers

water

the main agent of chemical weathering

weathering

the process by which rocks are broken down by forces of nature; physical and chemical

chemical weathering

when minerals in a rock react chemically with air or water (can weaken or dissolve away causing crumbling)

ice wedging

when rain water or melted ice soaks into tiny cracks in a rock and freezes; ( the ice expands and can split rocks inverted )