1. How is our Earth’s surface worn down?
Destructive Forces
How is our Earth’s surface worn down?

2. What is a destructive force?

3. Weathering Weathering is a _______________ force.
There are two types of weathering: _________ & _________.

4. Weathering Weathering is a destructive force.
There are two types of weathering: _________ & _________.

5. Weathering Weathering is a destructive force.
There are two types of weathering: mechanical & chemical.

6. Weathering
______________weathering is the slow breaking apart or wearing away of rock into smaller pieces.
These smaller pieces are known as ______________.
Weathering can be caused by ___________, ________ & __________.

7. Weathering
Mechanical weathering is the slow breaking apart or wearing away of rock into smaller pieces.
These smaller pieces are known as _________________.
Weathering can be caused by __________, _________ & _________.

8. Weathering
Mechanical weathering is the slow breaking apart or wearing away of rock into smaller pieces.
These smaller pieces are known as sediment.
Weathering can be caused by __________, _________ & _________.

9. Weathering
Mechanical weathering is the slow breaking apart or wearing away of rock into smaller pieces.
These smaller pieces are known as sediment.
Weathering can be caused by water, ice & wind.

10. Weathering
______________ weathering when weathered rock in changed into other materials.
_________ is the main factor that causes chemical weathering.
Water can dissolve some ________ in the air and soil to form a ____ ___ water that can dissolve some _______, like limestone.
This is how _________ are formed.

11. Weathering
Chemical weathering when weathered rock in changed into other materials.
_________ is the main factor that causes chemical weathering.
Water can dissolve some ________ in the air and soil to form a ____ ___ water that can dissolve some _______, like limestone.
This is how _________ are formed.

12. Weathering
Chemical weathering when weathered rock in changed into other materials.
Water is the main factor that causes chemical weathering.
Water can dissolve some ________ in the air and soil to form a ____ ___ water that can dissolve some _______, like limestone.
This is how _________ are formed.

13. Weathering
Chemical weathering when weathered rock in changed into other materials.
Water is the main factor that causes chemical weathering.
Water can dissolve some chemicals in the air and soil to form a weak acid water that can dissolve some rocks, like limestone.
This is how _________ are formed.

14. Weathering
Chemical weathering when weathered rock in changed into other materials.
Water is the main factor that causes chemical weathering.
Water can dissolve some chemicals in the air and soil to form a weak acid water that can dissolve some rocks, like limestone.
This is how caves are formed.

16. Erosion
_____ is the carrying away of sediment by moving wind, water, or ice.

17. Erosion
Erosion is the carrying away of sediment by moving wind, water, or ice.

19. Water
In rivers and streams, rocks _____ _____ by _____ rub against other rocks.
Over time, _____ _____ break off the rocks.
The rocks are ____ ____ and become ________ and _______.

20. Water
In rivers and streams, rocks moved along by water rub against other rocks.
Over time, _____ _____ break off the rocks.
The rocks are ____ ____ and become ________ and _______.

21. Water
In rivers and streams, rocks moved along by water rub against other rocks.
Over time, sharp edges break off the rocks.
The rocks are ____ ____ and become ________ and _______.

22. Water
In rivers and streams, rocks moved along by water rub against other rocks.
Over time, sharp edges break off the rocks.
The rocks are worn down and become smoother and smaller.

23. Water __________ erosion can change shorelines.
Waves can ____ ____ large amounts of ____ and ____.

24. Water Ocean-wave erosion can change shorelines.
Waves can ____ ____ large amounts of ____ and ____.

25. Water Ocean-wave erosion can change shorelines.
Waves can wash away large amounts of sand and rock.

26. Water Erosion

27. Georgia's Providence Canyon

29. Wind
Wind can make loose bits of sand and soil ____ or ______ across land.

30. Wind
Wind can make loose bits of sand and soil roll or bounce across land.

31. Wind
Wind can also cause particles of sand and soil to ___ _______ rocks and _____ ____ small pieces of rock.
In this way, ___ ____ ______ are carved by the wind over time.

32. Wind
Wind can also cause particles of sand and soil to rub against rocks and carry away small pieces of rock.
In this way, ___ ____ ______ are carved by the wind over time.

33. Wind
Wind can also cause particles of sand and soil to rub against rocks and carry away small pieces of rock.
In this way, new rock shapes are carved by the wind over time.

35. A ______ is a large mass of slow-moving ice that flows down a slope.

36. A glacier is a large mass of slow-moving ice that flows down a slope.

37. As a glacier moves, it collects ___________ at its ____.
A glacier can ________mountainsides that form ________ valley and canyons.

38. As a glacier moves, it collects rocks and soil at its base.
A glacier can _______ mountainsides that form ________ valley and canyons.

39. As a glacier moves, it collects rocks and soil at its base.
Glaciers can carve out mountainsides that form U-shaped valley and canyons.