pg / 14/ 2013 Focus: Weathering, Erosion, Deposition Objective: 6.E.2.3 Today I will evaluate the forces that shape the lithosphere. HW: review and practice Warm UP: Intro and Review (read both passages and answer the questions – complete sentences)
Warm-up: Graffiti Brainstorm Weathering, Erosion, Deposition, Rocks, Rock Cycle, Minerals, Physical, Chemical
Homework: Draw a mountain. Then draw the same mountain 1 million years later. Describe what happens to the mountain over time. (The words: weathering, sediment, erosion, and deposition must be included.)
Weathering and Erosion
Weathering Weathering is: Process where natural forces break down rocks
Physical Weathering: Rocks breaking down with out changing Chemical Weathering: Rocks breaking down changing the composition and pulling minerals out the rocks
Type of Weathering: Frost Wedging Rocks split apart when water freezes and expands.
Frost Wedging slowly broke up this sedimentary rock into unusual shapes.
The earth's surface is constantly being eroded. This means that rocks are broken up into smaller pieces by weathering agents such as wind, water, and ice. These small pieces of rock turn into pebbles, gravel, sand, and clay. They tumble down rivers and streams. These pieces settle in a new place and begin to pile up and the sediments form flat layers. Over a long period of time, the pieces become pressed together and form solid rock called sedimentary rock. Most sedimentary rocks form under water. Most of the earth has been covered by water some time in the past. 70% of the earth is covered by water now. So sedimentary rocks are common all over the world. Sedimentary rocks are often rich in fossils. weatheringsedimentssedimentaryfossilsweatheringsedimentssedimentaryfossils
Plant Roots Trees, bushes, and other plants may grow in cracks in rocks as the roots grows -> split rock
Water Water weathers rock by rubbing it over and over again.
Acid Rain Rain or snow has been polluted.
Acid Rain
Erosion The process where water, ice, wind or gravity moves bits of rock and soil.
What is the Difference Between Weathering and Erosion?? Weathering: If a particle is loosened but stays in one place. Erosion: Once the particle starts moving.
Deposition Deposition: sediment is placed in a new location Gravity: important part of erosion and deposition
Which mountain experienced the most erosion? Height in the year 1508 A.D. Height in the year 2008 A.D. Mountain A1500 Meters1450 Meters Mountain B1500 Meters1250 Meters Mountain C1500 Meters1320 Meters Mountain D1500 Meters1400 Meters
Which mountain experienced the most deposition? Height in the year 1508 A.D. Height in the year 2008 A.D. Mountain A1500 Meters1450 Meters Mountain B1500 Meters1250 Meters Mountain C1500 Meters1320 Meters Mountain D1500 Meters1400 Meters
Weathering Erosion Deposition
Water Erosion Rivers, streams, and runoff
Water In this picture the running water eroded the sides of this canyon and created the V-shaped valleys.
Ice Erosion Glaciers – large mass of ice that moves over land Glaciers carve land, move sediments, break up rock This is a picture of a glacier which carves out a U-shaped valley where it flows dragging rocks and boulders along the way.
Wind Erosion
Wind These rocks have been blasted by wind and sand causing them to become rounded.
Mass Movements Landslides, mudslides
Creep This is a diagram of creep. The hillside slowly slips over many years from temperature or water.
Ocean waves, currents – powered by wind -> move thousands of tons of sand on beaches can change the look of the land and shape a variety of coastal landforms Barrier islands – long, narrow islands that develop parallel to the coast
Port Campbell National Park Movement of water, constant action of waves breaking against the cliffs Caused slow wearing of the cliffs
r/grandcanyon/grandcanyon.ht ml r/grandcanyon/grandcanyon.ht ml r/grandcanyon/grandcanyon.ht ml 5/canyon35.html
Sediment can be transported by wind and water. Copyright © 2010 Ryan P. Murphy
Picture of sediment deposition of the Amazon Delta from space. Copyright © 2010 Ryan P. Murphy
Picture of sediment deposition of the Amazon Delta from space. Copyright © 2010 Ryan P. Murphy
Activity! Not Smart Board. –Arrange the terms into the correct order by moving them around. START END
Activity! Not Smart Board. –Arrange the terms into the correct order by moving them around. START END
Activity! Not Smart Board. –Arrange the terms into the correct order by moving them around. START END
Activity! Not Smart Board. Answer: START END
Sedimentary Rocks –-Sediments are compacted and cemented together. –Caused by weathering, erosion, and deposition. –- Copyright © 2010 Ryan P. Murphy
Usually layered. Copyright © 2010 Ryan P. Murphy
Usually horizontal
But not always
?
Compression Fold Syncline