Transcript Movements of the Earth

MOVEMENTS OF THE
EARTH
Ms. Sobek
1.20.09
3.26.13 Notes and Tectonic Lab
• Calculate average between 6 s and 11 s.
S
The interior Structure of the Earth
P The Crust- between 12-64 km
thick. Made mostly of silicon,
aluminum, and magnesium
 Mantle- 3000 km thick, made of
iron and magnesium. Continually
changes shape due to heat and
pressure.
 Core- the outer layer is liquid
molten rock. Inner layer is solid
rock. Mostly made of iron, nickel,
and cobalt
 Lithosphere and
asthenosphere?
The Earth’s Curst has Plates
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1.
2.
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7.
 Crustal Plates - The Earth's crust is divided into a
series of plates:
Eurasian Plate
African Plate
Antarctic Plate
Indian-Australian Plate
Pacific Plate
South American Plate
North American Plate
P Convergent Plate Boundaries
• Where plates move
towards each other
or past each other,
great tension results.
This tension builds
up until the plates
slide past or under
each other, during
an Earthquake.
P
Divergent Plate Boundaries • Where plates move away from each other, molten rock
(magma) from deep beneath the crust, oozes out through
the space between the plates forming a Volcano
Transform Boundaries
• Where the two plates slide against each other in a
sideways motion.
• The result of two massive plates pushing against one
another is that massive amounts of energy build up.
Occasionally this energy is released suddenly in the form
of large earthquakes.
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How come the earth isn’t getting bigger?
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Theory of Continental Drift
• In 1912, Alfred Wegener noticed the similarities between
the coastline shapes and the fossils of continents such as
Africa and South America. He suggested that the
continents may have once been joined together in a
large super-continent, and had since drifted to their
present positions.
Spring 2008 - PISD
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Continental Drift
MS Science TAKS Review - Obj 5
10
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Pangaea
• Pangaea was the name
given to the one large
super-continent that
may have existed up till
200 million years ago
before dinosaurs
roamed the Earth
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Theory of Plate Tectonics
 This is the present well-
accepted idea that where the
plates move towards each
other, earthquakes occur, and
where the plates move away
from each other, ocean basins
occur. For these to occur,
there are slow-moving
convection currents within the
mantle.
P
Convection Currents
A/C
Snickers Lab 1
Open the Snickers™ candy bar.
 Illustrate the Snickers™ bar in your science notebook
before following this procedure.
 Hold each side of the Snickers™, and slowly pull it apart.
Observe what is happening.
 Record your observation, and answer all questions in
complete sentences.
1. What type of plate boundary does this represent?
2. What type of landform is being created?
3. What are some examples of landforms created, and
where are they located?
A/C
Snickers Lab 2
Illustrate the Snickers™ bar before following this
procedure.
Holding a piece of the Snickers™ in each hand, slowly
push the pieces together.
Record your observation.
1. What type of plate boundary does this represent?
2. What type of landform is being created?
3. What are some examples of landforms created, and
where are they located?
A/C
Snickers Lab 3
Illustrate the Snickers™ bar before following this
procedure.
 Pull the two pieces of Snickers™ apart. Slowly rub the
candy side to side.
 Record your observation.
1. What type of plate boundary does this represent?
2. What natural disaster is common at this type of
boundary?
3. What type of landform is created at this plate
boundary?
4. What are some examples of landforms created and
where are they located?
E
1.What type of boundary is this a
picture of? _____________
2.What type of land form will it
create?
3.Explain how a convection current
caused this event.