Today: We will explain the changes on Earth’s surface and be able to determine how rocks provide valuable information about Earth’s crust. You will work.

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Presentation transcript:

Today: We will explain the changes on Earth’s surface and be able to determine how rocks provide valuable information about Earth’s crust. You will work with a partner to describe, explain and identify various examples of how Earth’s surface changes through natural and chemical processes.

The Basics… WEATHERING: The breakdown of rocks MECHANICAL weathering = the natural and physical breakdown of rock CHEMICAL weathering = the breakdown of rock by chemical reactions Acid precipitation

MECHANICAL WEATHERING Erosion: Movement of sediment by wind, water, glaciers and gravity WATER! Major agent of erosion Rivers Oceans Freeze/Thaw: water freezes and expands, thaws and rocks break apart Plants: roots may grow into tiny cracks in rocks and exert force, breaking the rock

Test It… You will see a series of pictures. One partner will look at the picture and describe it to his/her partner. The partner will write down what Earth process they believe is represented by the picture. *We are NOT giving answers here! IE: erosion by water; chemical weathering; etc… Then, partners switch positions. Repeat!

PARTNERS SWITCH!

Were You Right?!

EROSION BY WATER

CHEMICAL WEATHERING

EROSION BY WATER

MECHANICAL BY FREEZE-THAW

MECHANICAL BY PLANTS

EROSION BY WIND

EROSION BY WIND

EROSION BY WATER

EROSION BY WATER

MEHCANICAL BY PLANTS

CHEMICAL WEATHERING

MEHCANICAL BY FREEZE-THAW