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Class 9b: Coastal landforms and rivers. Ocean erosion.

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Presentation on theme: "Class 9b: Coastal landforms and rivers. Ocean erosion."— Presentation transcript:

1 Class 9b: Coastal landforms and rivers

2 Ocean erosion

3 Coastal landforms from erosion On newer, more rugged coastlines

4 Ocean transport Longshore currents: waves not parallel to shore

5 Ocean deposition Beaches!

6 Coastal deposition On coastlines already worn down

7 Coastal deposition

8 Stabilizing the coast Harbors or bays may close over, cliffs may fall

9 Stabilizing the coast Unintended consequences

10 Coral reefs The only organic landform

11 Coral reefs

12 Absorb energy from waves and protect shores

13 Fluvial basics Fluvial processes: involving running water

14 Fluvial basics Watershed: all the land that drains into a stream

15 Fluvial erosion Amount of erosion depends on: –Speed of river –Degree of turbulence –Type of bedrock

16 Fluvial transport Material carried by a stream is the stream load Bed load, dissolved load, or suspended load

17 Fluvial deposition Found all along rivers; especially at mouth


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