1. Weathering and Erosion

2. Vocabulary 7.5 Weathering Mechanical weathering Ice wedging
Chemical weathering
Biological weathering
7.6
Erosion
Deposition
Valley
Plains
Delta
Fiords

3. 7.5 Weathering Breaks Down Rocks
Weathering- slowly breaking down natural materials into smaller pieces

4. 3 Kinds of Weathering Mechanical Weathering Physical forces
Ice wedging
Wind
Water
Glaciers

8. Chemical reactions with rocks
Chemical weathering
Chemical reactions with rocks
CO2 (air)+ H2O (rain) H2CO3 (an acid)
Acid dissolves limestone= caves
Acid rain (pollution gas mixing with water in the air) = dissolved minerals
Oxygen in air + water = rust

12. 3. Biological weathering
Living things that cause mechanical or chemical weathering
Lichen = produces an acid
Roots grown in cracks = split rocks

14. 7.6 Erosion
The movement of weathered rock from one place to another = erosion
Fast or slow movement
Big or small sizes
Small to large distances
When the material stops moving = deposition

15. Weathered rock can move by:
Gravity (rock slide, avalanche)

17. 2. Wind (particles in the wind, dust storm)

19. 3. Water (rivers, streams)

20. Valley= V- shaped
Plains = flat areas
Delta= large triangle shaped area as a river enters a lake or ocean (sediment build up)

24. 4. Ice (glaciers)

26. U shaped valleys, round bottoms, steep sides

27. Fiords
Along the coast
Long narrow inlets of the sea