Erosion and Deposition PPT - Monadnock Regional High School

[Pages:15]Erosion and

Deposition

Agents, Forces, and Results

What Caused This?

What is Erosion?

? Erosion ? moving of rock material from one place to a new location

Weathering has to happen before erosion. The rocks have to be broken into smaller sediments before they can be eroded away.

Weathering & Erosion Study Jams

AGENTS OF EROSION

? Wind ? Flowing water ? Waves ? Gravity ? Moving Ice (glaciers)

What Is Wind Erosion?

? Wind ? sediments that have been transported by

wind appear pitted (holes) and frosted (glazed)

? Effective in moving small, loose material ? Occurs in areas where there is not enough rainfall to

support vegetation ? Main effects:

1. Wind causes small particles to be lifted and moved away. 2. Suspended particles may impact on solid objects causing

erosion by abrasion (rubbing).

What Is Water Erosion?

? Flowing Water ? sediments transported by water appear rounded and smooth

? Most influential force in erosion ? Transports large objects with fast moving streams ? Helps create landforms:

? rivers ? lakes ? oceans

What Is Wave Erosion?

? Waves ? relentless pounding can throw broken rocks

against the shore and wash away fine grains

? Erodes (transports):

? softer/weaker rock first ? harder/more resistant left behind

? Can create landforms based on where waves hit land and which rocks they transport

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