Shaping the Earth External Forces. Changing the Look of the Earth  Weathering: physical and chemical processes that change the rocks on the Earth. 

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Presentation transcript:

Shaping the Earth External Forces

Changing the Look of the Earth  Weathering: physical and chemical processes that change the rocks on the Earth.  2 Types: Mechanical Weathering Mechanical Weathering Chemical Weathering Chemical Weathering

Mechanical Weathering  Just think of parts of an engine…..  There are many parts that make up the whole engine  Now think of a Rock breaking into smaller pieces  Frost, water, human activity, plants roots, etc can break up rocks into smaller pieces

Chemical Weathering  Look at the picture of the Statue of Liberty NOW  Check out Lady Liberty back in the day…  The Statue of Liberty turned green due to chemical weathering.  Chemical Weathering occurs when a rock changes into something completely new due to air and water elements interacting with the rock.

Erosion  Erosion: when weathered materials are moved by the action of wind, water, ice, or gravity  3 Types: 1. Water Erosion 2. Wind Erosion 3. Glacial Erosion

Water Erosion  When rocks travel downstream by a river  Abrasion: the grinding away of rock by bigger rocks  Delta: when rocks are finally deposited (dumped) out by a river - Fan like form  Waves along the coast can make beaches expand or shrink Nile River Delta

Wind Erosion  Wind picks up rocks and deposits them in other locations  Examples: Dust Storms  Loess: wind blown silt and clay that make up fertile soil

Glacial Erosion  Glaciers are huge blocks of ice that are moved by gravity.  Glaciations occurs when glaciers move over a landform  Moraine are the rock formations that are left by the glacier. Usually found on the sides or the edges of the glacier.