1. Weathering 1/4/16 10-1a pgs. 246-250 IN: How does sediment form? Glue in the new Table of Contents

2.  Weathering - the breakdown of rock into smaller and smaller pieces.

4.  Mechanical  Chemical Types of Weathering

5.  Mechanical Weathering - the breakdown of rock by physical means. –Ice –Wind –Water –Gravity –Plants –Animals –Humans

6.  When water seeps into a crack in a rock and freezes it expands.  When it expands, it pushes against the sides of the crack, forcing it to open wider. Ice Wedging

7.  An enormous mass of moving ice. Glaciers

9.  Abrasion - the action of rocks and sediment grinding against each other and wearing away exposed surfaces. Wind and Water

11. Valley of Fire State Park

16.  River rocks  Sandblasting  Rocks tumbling down a mountainside

17.  Like ice wedging –Plants get into smaller cracks and as they grow they split the rock apart.

18.  Burrowing  Worms  Chemical Weathering

20. OUT: Describe one type of mechanical weathering.

21. Chemical Weathering 1/5/16 10-1b pgs. 246-250 IN: Describe the similarity between the ways tree roots and ice mechanically weather rock.

22.  When water seeps into a crack in a rock and freezes it expands.  When it expands, it pushes against the sides of the crack, forcing it to open wider. Ice Wedging

23.  Like ice wedging –Plants get into smaller cracks and as they grow they split the rock apart.

24.  Chemical Weathering - the chemical breakdown of rocks and minerals into new substances. –Water –Weak acids –Air –Soil

25.  Water causes many things to dissolve. –Even hard rock, like granite, is broken down by water.

26.  Acid rain is caused due to pollution.  Can cause very rapid weathering of rock.

28.  Breaks down limestone found underground –Forms caves

29.  Lichens produce organic acids that can slowly break down rock.

30.  Oxidation - a chemical reaction in which an element, such as iron, combines with oxygen to form an oxide. Fe + O  FeO ironoxygenIron oxide

31.  Water speeds up this process. –rust

32. Red Rock Canyon

33. Mars

34. OUT: Why does acid precipitation weather rocks faster than normal precipitation does?