1. L.O:
weathering, erosion, deposition

2. When rocks are exposed to the
environment, they can weather (break
down).

3. Weathering when rocks breakdown into
sediment (rock particles)
because they are exposed to the
environment

4. Two kinds: physical and chemical
weathering

5. Physical weathering rocks breakdown
into sediment (small rock particles)
caused by ice or biological activity

6. Chemical weathering: when the
minerals in rocks dissolve or rust
from oxygen or acid rain
Chemical weathering happens in warm (hot) and
humid (wet) environments.

7. Water is the greatest cause of
weathering.

8. Small rocks weather faster than big
rocks

9. Small rocks weather faster than big
rocks

10. Rocks with soft minerals are less
resistant to weathering

11. Rocks with harder minerals are more
resistant to weathering

13. Soil is the result of the weathering of
rocks and biological activity.

14. Erosion: when sediment (rock
particles) are transported away.
Wind, gravity, ice (glaciers) and
especially running water are agents
of erosion

15. Streams:
Streams (rivers) are moving water.

16. A stream’s velocity depends on its
• Gradient (slope)
• Discharge (volume of water it carries)

17. The meander (outside of the bend) of
a stream has the MOST erosion.

18. “C” has most erosion

19. Inside the bend (meander) has most
deposition (“A”).

20. Which has more erosion? Which has
more deposit?

21. Streams create V-shaped valleys

22. Streams create V-shaped valleys

23. Complete page 74.

24. Glaciers are huge slow-moving
“rivers of ice”.
Glaciers transport all sizes of rocks as
they move.

25. Glaciers create U-shaped valleys.

26. Deposition:
When agents of erosion deposit the
sediments they carry.

27. Deposition: When agents of erosion
deposit the sediments they carry.

28. Streams deposit sediment with
horizontal sorting.
• As a stream slows down: the
Largest, heaviest, Roundest and densest
particles are deposited first.

29. Glaciers deposit unsorted (mixed-up
rocks) piles .