Transcript Weathering and Erosion

pg. 120
1/ 14/ 2013
Focus: Weathering, Erosion,
Deposition
Objective: 6.E.2.3 Today I will
evaluate the forces that shape
the lithosphere.
HW: review and practice
Warm UP: Intro and Review
(read both passages and answer
the questions – complete
sentences)
Warm-up: Graffiti Brainstorm
Weathering, Erosion,
Deposition, Rocks, Rock
Cycle, Minerals, Physical,
Chemical
 Homework:
Draw a mountain.
Then draw the same mountain 1
million years later. Describe
what happens to the mountain
over time. (The words:
weathering, sediment, erosion,
and deposition must be
included.)
Weathering and Erosion
Weathering
 Weathering
is: Process where
natural forces break down rocks
 Physical
Weathering: Rocks breaking
down with out changing
 Chemical
Weathering: Rocks
breaking down changing the
composition and pulling minerals out
the rocks
Type of Weathering: Frost Wedging
Rocks split apart
when water freezes
and expands.
Frost Wedging
slowly broke
up this
sedimentary
rock into
unusual
shapes.

The earth's surface is constantly being
eroded. This means that rocks are broken
up into smaller pieces by weathering
agents such as wind, water, and ice.
These small pieces of rock turn into
pebbles, gravel, sand, and clay. They
tumble down rivers and streams. These
pieces settle in a new place and begin to
pile up and the sediments form flat layers.
Over a long period of time, the pieces
become pressed together and form solid
rock called sedimentary rock. Most
sedimentary rocks form under water. Most
of the earth has been covered by water
some time in the past. 70% of the earth is
covered by water now. So sedimentary
rocks are common all over the world.
Sedimentary rocks are often rich in fossils.
Plant Roots
Trees, bushes, and
other plants may grow in
cracks in rocks as the
roots grows -> split rock
Water
 Water
weathers rock
by rubbing it
over and over
again.
Acid Rain
Rain or snow
has been
polluted.
Acid Rain
Erosion
 The
process where water, ice,
wind or gravity moves bits of
rock and soil.
What is the Difference Between
Weathering and Erosion??
 Weathering:
If a particle is
loosened but stays in one place.
 Erosion: Once the particle starts
moving.
Deposition
 Deposition:
sediment is placed in
a new location
 Gravity: important part of
erosion and deposition
Which mountain experienced the
most erosion?
Height in the
year 1508 A.D.
Height in the
year 2008 A.D.
Mountain A
1500 Meters
1450 Meters
Mountain B
1500 Meters
1250 Meters
Mountain C
1500 Meters
1320 Meters
Mountain D
1500 Meters
1400 Meters
Which mountain experienced the
most deposition?
Height in the
year 1508 A.D.
Height in the
year 2008 A.D.
Mountain A
1500 Meters
1450 Meters
Mountain B
1500 Meters
1250 Meters
Mountain C
1500 Meters
1320 Meters
Mountain D
1500 Meters
1400 Meters
Weathering  Erosion  Deposition
Water Erosion
 Rivers,
streams, and runoff
Water
In this picture
the running
water
eroded the
sides of this
canyon and
created the
V-shaped
valleys.
Ice Erosion
Glaciers – large
mass of ice that
moves over land
Glaciers carve
land, move
sediments, break
up rock
This is a picture of a glacier which
carves out a U-shaped valley
where it flows dragging rocks and
boulders along the way.
Wind Erosion
Wind

These rocks
have been
blasted by
wind and
sand causing
them to
become
rounded.
Mass Movements
 Landslides,
mudslides
Creep
This is a diagram of creep.
The hillside slowly slips
over many years from
temperature or water.
 Ocean
waves, currents –
powered by wind -> move
thousands of tons of sand
on beaches can change
the look of the land and
shape a variety of coastal
landforms
 Barrier islands – long,
narrow islands that
develop parallel to the
coast
Port Campbell National Park
 Movement
of
water, constant
action of waves
breaking against
the cliffs
Caused slow
wearing of the
cliffs


http://www.nationalgeographic
.com/ngkids/games/braintease
r/grandcanyon/grandcanyon.ht
ml
http://www.nationalgeographic
.com/xpeditions/lessons/07/g3
5/canyon35.html
 Sediment
can be transported by wind
and water.
Copyright © 2010 Ryan P. Murphy
 Picture
of sediment deposition of the
Amazon Delta from space.
Copyright © 2010 Ryan P. Murphy
 Picture
of sediment deposition of the
Amazon Delta from space.
Copyright © 2010 Ryan P. Murphy
 Activity!
Not Smart Board.
– Arrange the terms into the correct order
by moving them around.
START
END
 Activity!
Not Smart Board.
– Arrange the terms into the correct order
by moving them around.
START
END
 Activity!
Not Smart Board.
– Arrange the terms into the correct order
by moving them around.
START
END
 Activity!
Not Smart Board.
 Answer:
START
END
 Sedimentary
Rocks
– -Sediments are compacted and
cemented together.
– Caused by weathering, erosion, and
deposition.
––-
Copyright © 2010 Ryan P. Murphy
 Usually
layered.
Copyright © 2010 Ryan P. Murphy
Usually horizontal
But not always
?
Compression Fold
Syncline