Catastrophic Events and Weathering Erosion

Weathering, Erosion & Deposition

Weathering

-Breaks rocks apart

-Usually happens very slowly

• Happens physically/mechanically, chemically, and biologically

-Creates sediment

Multiple Choice

What happens in ice wedging?

• Water rubs on rocks

• Wind rubs on rock

• Plants roots break apart the ground as they grow

• Water freezes in cracks to break apart rocks

Erosion

-Moves sediment (pieces of solid material, like rocks, soil, and dead plant and animal parts)

-Can happen quickly or slowly

-Agents of erosion include wind, water, ice (glaciers), gravity

Canyon

Is created by the water eroding the sediment of the rock.

HABOOB

Phoenix, Arizona,USA

August 2020

BIG DUST STORM

Erosion by Wind & Waves

Kangaroo Island, Australia

Rocks shaped by wind and waves

Deposition

• Drops eroded sediment off in a different place

• Occurs when water slows down

• Results in the formation of a delta at the mouth of a river

Sand Dune

Sand dunes are created by wind.

Multiple Select

Check all of the agents of weathering.

• wind

• water

• gravity

• ice

Multiple Choice

You woke up this morning to discover that your car is covered with a thin layer of dust (PM 2.5). This is an example of:

• weathering

• erosion

• deposition

Multiple Choice

When we walk along the seashore, we look for shark teeth in the sand. This is an example of

• weathering

• erosion

• deposition

Multiple Choice

This landform is created by deposition.

• mountain

• volcano

• delta

• sand dune

Multiple Choice

As a river approaches the ocean, the water speed __________ and sediments are ______________.

• increases; deposited

• decreases; weathered

• decreases; weathered

• decreases; deposited

Multiple Choice

How does freezing water cause the weathering of rocks?

• It keeps the rocks in place.

• It expands cracks and breaks rocks.

• It makes the rocks last longer

• It causes rocks to fall in landslides

Multiple Choice

The process of transporting weathered material is known as...

• Weathering

• Erosion

• Deposition

Open Ended

Explain how this picture shows evidence of weathering, erosion, and/or deposition.

Poll

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• Great! I could explain it to someone else easily.

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