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Land Forms
 There are many land forms:
Mountains, rivers, beaches,
canyons...
Land Forms
 Land Forms are created by inside
forces of the earth: uplifting,
earthquakes, volcanoes.
Land Forms
 Land Forms are also created by
outside forces of the earth:
weathering and erosion.
Uplift
 A process
that moves
the surface
of the
earth to a
higher
elevation.
Uplift
The Himalayas
Were created by uplifting.
The Himalayas are still getting taller!
Uplift
Mountain
A mountain is
the highest
kind of land
form.
A mountain
has a peak.
Plateau
When a large flat area is uplifted.
An example of a plateau is a mesa.
Weathering
The destructive process that breaks down rocks
into sediment.
Weathering
Weathering
breaks
rocks by
freezing
and
thawing.
Weathering
 This rock
has been
weathered
down.
erosion
 The
process of
moving
weathered
material or
sediment
from one
location to
another.
erosion
 uses water,
wind, ice
and gravity
to break
apart rock..
Weathering and erosion will change mountains
into plains.
Sediment/plain
Plain
A plain is flat land.
Valley
A valley is low land between hills
or mountains.
Glaciers Glaciers carved a U-shaped
valley in California’s Yosemite park.
Glacier
Rivers and streams will carry rock
fragments down the mountain.
Rivers usually carve sharp, V shaped
valleys and canyons.
As the river gets to flat land, it will slow
down and begin to create meanders.
A meander is a turn or river bend.
Eventually the river will find a straighter
path and create an oxbow lake.
This is how an oxbow lake is created.
During heavy rains, the river will become
flooded.
Flood Plain
You get the most deposit left behind
after a heavy rain or flood.
Flood Plain
As the rocks travel down the river, they
will get smaller and smaller.
Rivers also create canyons.
canyons
•The
Colorado
River is
responsible
for creating
the Grand
Canyon.
Delta
•Rock or
sediment
deposits
at the
end of a
river.
Beaches are temporary deposits of
grain sized rocks, sand.
•The waves wash away the sand.
Sand must be added constantly or the
beach will disappear.
What would happen to the beaches
if we block all the rivers?