Part Two!

Part Two!

• Magic

Earth Quiz (Part Two)

Water causes ErosionWhen rain falls to the Earth it

can evaporate, sink into the ground, or flow over the land as Runoff.

When it flows over land, erosion occurs.

Runoff picks up pieces of rock and "runs" downhill cutting tiny grooves (called rills) into the land.

Water causes ErosionHow much erosion takes

place is determined by the:

• Sum (amount)• Slope• Speed• Surface

Can you act increasing and decreasing the

four S’s?

Ice Causes Erosion

Glaciers wear down the landscape; by picking up and

carrying debris that moves across the land along with the ice.

Ice Causes ErosionGlaciers can pick up and carry sediment that ranges in size from

sand grains to boulders bigger than houses.

Moving like a conveyor belt and a bulldozer, a single glacier can move millions of tons of material!

Ice Causes Erosion

How much erosion takes place is

determined by the:

• **Sum (Glaciers are massive!)

• Slope• Speed• Surface

Gravity causes erosion

landslide clip.mpeg

Creep, Slump, Landslides, Mudslides, and Avalanches.

These are examples of mass movement (or called mass wasting)

Slower Faster

Gravity causes Erosion

How much erosion takes place is determined by the:

• Sum• **Slope• Speed

• **Surface

Plants CAN CAUSE weathering

Plants CAN PREVENT erosion

DepositionRock particles that are picked up and transported during

erosion will ultimately be deposited somewhere else

Deposition is the process by which sediments (small particles of rock) are laid down in new locations.

• Together, Erosion and Deposition build new landforms. • Deltas

• Canyons• Meanders • Floodplains

Delta

Where rivers meet the ocean is called the

mouth of the river. Soil and dirt carried by

these rivers is deposited at the mouth, and new

land is formed. The new, soil-rich land is known as a Delta

Canyons

This simple animation provides you with a visualization of how the

Colorado River has "downcut" into the rock layers of the Grand

Canyon.

How long it took to carve the Grand Canyon is debated by

geologists. Some estimates are between 6

and 8million years, which is very recent

by comparison.

Canyons are large valleys created by a

river or stream.

Meanders

Meandering streams wander side to side as they constantly seek out the lowest elevation.

This constant motion creates a series of S-shaped “loops”.

Meanders

Stream Velocity varies from one side to the other side of the “S”, resulting in erosion in some places and

deposition of sediments in others.

Floodplains• Floodplains form along the

banks of mid-order streams and larger rivers.

• These are low-lying areas along the sides of a river channel that have regular times of heavy waterflow to cause the river to spill over and flood the land.