lesson 1
process by which rock is broken down into smaller pieces by physical change
physical weathering
process by which sediment and other materials are moved from one place to another
erosion
mounds of wind deposited sand
dunes
a mass of gradually moving or flowing ice
glacier
there are 7 causes of physical weathering. give two causes of physical weathering
temperature change, pressure change, animal action, wind, water, gravity and plant growth
breaking down and wearing away of rock material by the mechanical action of other rock
abrasion
when eroded materials are dropped
deposition
thick deposits of wind blown fine grained sediment
loess
a large natural stream of water that flows into an ocean or other large body of water
river
give one example of chemical weathering
oxidation, acid, iron
other chemical combine with oxygen
oxidation
measure of change in elevation over a certain distance
gradient
when surface is mostly pebbles and small broken rocks
desert pavement
a deposit formed by sediment that accumulates at the mouth of a river
delta
tiny grains of broken down rock
sediment
process by which the outer layers of rock to separate from the underlying layers
exfoliation
many layers of deposited sediment can form a flat area
floodplain
all material carried and deposited by a glacier
glacial drift
a body of fresh or salt water that is surrounded by land
lake
when waves erode and undercut rock to make steep slopes
sea cliff
causes cracks in rocks to expand as water seeps in and freezes
ice wedging or frost wedging
place where land and a body of water meet
shoreline
when chunks of ice are deposited by a glacier and glacial drift builds up around the ice blocks, next the ice melts and forms
kettle lake
a region of increased elevation on Earth's surface that rises to a peak
mountain
a hole in the ground caused by the collapse of an underground cavern, then becomes plugged by sediment and fills with water
sinkhole lake