Part Two! • Magic
Feb 22, 2016
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.