5-3.1 Explain how natural processes affect Earth's oceans
5-3.1 Explain how natural processes affect Earth's oceans and land in constructive and destructive ways. What do all of these pictures have in common?
All of the rocks have been worn away by something. Changes to the Earth's Surface There are natural processes that can affect Earth's
oceans and land. We have observed some of these processes in our Stream Table Labs. Can you name some of these processes? Weathering
l Weathering is a general term used to describe processes that break down rocks at or near the surface of the earth. l This process causes the surface of the earth to dissolve, decompose, and break into smaller pieces called sediments. There are two types of weathering:
PHYSICAL WEATHERING Physical weathering is the breaking down of earth material without undergoing a chemical change. Examples: 1. when water expands as it freezes in cracks and then thaws 2. when rocks are heated by day and cooled by night 3. when roots of plants break up the earth - root wedging
4. when water runs over a surface or sand blows over a surface Chemical Weathering Chemical weathering changes the minerals that make up rock. Example: l water dissolving minerals in the rocks and then washing them away
l Water is an important cause of - rivers and streams flow over earth's surface weathering. - rainfall causes floods l Plants can even cause weathering - the roots break apart the rocks
(Why do you think this is considered weathering?) l Changes in temperature can break rocks apart l Ice can form inside of cracks in the rock and cause it to break even more Bryce Canyon in Utah was formed by
ice weathering. Weathering Let's review: Weathering is constantly changing the landforms around us. There are two types of weathering: chemical and physical.
Erosion Don't confuse weathering with erosion! Weathering breaks up the Earth's surface into small pieces called sediment. Erosion is the process of moving sediments from one place to another. Wind, water, gravity, ice and humans are all causes of erosion.
Deposition l The dropping, or depositing, of sediments by water, wind, or ice l Deposition builds up new land on Earth's surface (like the delta at the end of a river or the pile up of a sand dune in the desert) l Shells on the beach are deposition by ocean
waves. Weathering causes rocks and earth materials to break down The earth material is then
moved through erosion The earth material is finally dropped off through deposition The natural processes that change Earth's oceans and
land can be categorized in two ways: Constructive: Those processes that create landforms l Destructive: Those processes that destroy landforms Constructiv e Processes Deposition
Both Constructiv e and Destructive Processes Erosion
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