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1 Chapter 3.  What processes break down rock?  What processes wear down and build up rock?  What causes weathering?  How fast does weathering occur?

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Presentation on theme: "1 Chapter 3.  What processes break down rock?  What processes wear down and build up rock?  What causes weathering?  How fast does weathering occur?"— Presentation transcript:

1 1 Chapter 3

2  What processes break down rock?  What processes wear down and build up rock?  What causes weathering?  How fast does weathering occur? 2

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5  The process that breaks down rock and other substances. 5 Rate of Weathering Increases

6  Process by which rocks are physically broken down into smaller pieces. 6

7  5 Types of Physical Weathering  Animal Actions  Freezing and Thawing  Plant Growth  Release of Pressure  Abrasion 7

8 Animals and insects loosen and break apart rocks in the soil. 8

9 When water freezes in a crack of a rock it expands and makes the crack bigger. 9

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11 Plant roots enter cracks in rocks and as they grow force the cracks apart. 11

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13 As erosion moves material from the surface of a rock, pressure on the rock is reduced. This release of pressure causes it to crack and flake off like the layers of an onion. 13

14 Sand and other rock particles that are carried by wind, water, or ice can wear away exposed rock surfaces like sandpaper on wood. 14

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18  Animals and insects loosen and break apart rocks in the soil.  When water freezes in a crack of a rock it expands and makes the crack bigger.  Plant roots enter cracks in rocks and as they grow force the cracks apart.  As erosion moves material from the surface of a rock, pressure on the rock is reduced. This release of pressure causes it to crack and flake off like the layers of an onion.  Sand and other rock particles that are carried by wind, water, or ice can wear away exposed rock surfaces like sandpaper on wood. Animal Actions Freezing & Thawing Plant Growth Release of Pressure Abrasion 18

19  The process that breaks down rock through chemical changes. 19

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21  The 5 agents of chemical weathering  Water  Oxygen  Carbon dioxide  Living organisms  Acid rain 21

22  Water weathers rock by dissolving it. 22

23  Iron combines with oxygen in the presence of water in a processes called oxidation  The product of oxidation is rust, making rocks soft and crumbly. 23

24  CO 2 dissolves in rain water and creates carbonic acid  Carbonic acid easily weathers limestone and marble. 24 Sink holes

25 25 Alabama The Great Blue Hole: Belize Arizona

26  As plant roots grow they produce weak acids. that dissolve the rock around the roots. Lichens that grow on rocks also produce weak acids. 26

27  Compounds from burning coal, oil and gas react chemically with water forming acids.  Acid mixes with raindrops and cause very rapid chemical weathering of rock. 27

28  Water weathers rock by dissolving it.  Iron combines with oxygen in the presence of water in a processes called oxidation or rust, making rocks soft and crumbly.  CO 2 dissolves in rain water and creates carbonic acid which easily weathers limestone and marble.  As plant roots grow they produce weak acids. that dissolve the rock around the roots. Lichens that grow on rocks also produce weak acids.  Compounds from burning coal, oil and gas react chemically with water forming acids. Acid mixes with raindrops and cause very rapid chemical weathering of rock. 28 Water Oxygen Carbon Dioxide Living Organisms Acid Rain

29 29 The 2 most important factors that determine the rate at which weathering occurs are the:  1. Type of rock (what a rock is made of) – Certain rocks and minerals are naturally weaker than others, while others are more resistant (stronger).  2. The climate - Warmer, moister climates have the most weathering. Heat & Water speed up all chemical reactions. This is the most important factor in weathering.

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32  Complete Lesson 2 Assess Your Understandings  Review & Assessment #1-10 Page 111  *BRING FLASHDRIVE 12/5  Gizmo #8 Dec. 11th  Vocabulary Quiz Dec. 12th  Edible Landform Dec. 13th  Fairchild Challenge Dec. 18 th  Science in the News Dec. 20th


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