How does the earth change?

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Presentation transcript:

How does the earth change? Weathering How does the earth change?

1 2 3 4 5 6 7 8 9 10 11 12 Weathering Notes (p. 680-687) Page 2-1 date Weathering — breaking down of rocks into sediments (smaller pieces) by Mechanical or Chemical methods. 1) Mechanical — rocks are broken apart by a physical force. Chemical makeup of rock is not changed Heat dries, expands and cracks rocks Cold freezes water in cracks (ice wedging) Plants: roots enlarge cracks (root pry) Animals/Humans: digging, stomping, running, mining Abrasion: moving particles grind rock

2) Chemical — chemical reactions break down rock 13 14 15 16 17 18 19 20 21 22 23 24 25 2) Chemical — chemical reactions break down rock Chemical makeup of rock changes Examples: Oxidation (oxygen combines with it) forms rust Carbonic acid (water + carbon dioxide) dissolving limestone to form caves Plant acids from some roots and decaying plants weakens rock (lichens) Acid Rain, which is sulfuric acid in rain Rate of weathering: depends on type of rock and climate. (explanation) Write key words in the column on the left page. Write a summary at the bottom of the left page. (thank you to M. Ward, College Station ISD, and others for example slides)