Download - 5th Grade Ch. 9 Lesson 4 What is Erosion
Ch. 9 Lesson 4What is erosion?
erosion• movement of materials from 1 place
• destructive process
landslides• gravity quickly pulls rocks &
dirt downhill
landslide
deposition• placing of the materials in a new place
• constructive process
delta• place where heavy sediments are
deposited when a river meets an ocean
Mississippi River
The Mississippi Delta includes much of coastal Louisiana and Mississippi, including
the metropolitan area of New Orleans.
delta
rocks are ground into sediment under moving glaciers
Rivers can make deep canyons by erosion.
Grand Canyon
• waves, sand & gravel break rocks• form harbors & inlets- erode more
quickly than other areas• harbors= areas that are protected
from ocean waves
wave erosion
sand erosionsand erosion
•wind blows dust, soil or sand from 1 place to another
•makes sand dunes
wind erosion• winds blow topsoil from fields
• farmers surround fields with tall trees