Download 02-12 Plate Tectonics

Quick Review
1. The top portion of the Earth’s mantle =
asthenosphere
2. The asthenosphere is made of =
molten rock
3. How does the asthenosphere move =
it moves in a circular pattern called a
convection current.
Quick Review
4. Temperature of the
molten rock of the mantle
close to the core =
very high
5. Direction the molten
rock of the mantle near
the core moves =
rises
Quick Review
6. Temperature of the
molten rock in the
asthenosphere =
cooler
7. Direction the molten
rock in the asthenosphere
moves =
sinks
Lesson 7.4 – Plate Tectonics and Pangea
I can describe plate tectonics and Pangea. (4a)
1. The
lithosphere is
divided into
different pieces
called tectonic
plates.
I can describe plate tectonics and Pangea. (4a)
2. These plates
move over time, but
they move very
slowly.
A. The plates only
move a few
centimeters each
year.
I can describe plate tectonics and Pangea. (4a)
3. These plates move
because of the
convection currents
in the
asthenosphere.
A. As molten rock
rises from the core,
cools and sinks it
pushes the plates.
I can describe plate tectonics and Pangea. (4a)
4. Since continents are
part of the plates, as the
plates move, the
continents move.
5. 200 million years ago,
all of the continents
were once next to each
other and formed a
“supercontinent.” This
supercontinent is called
Pangea.
I can describe plate tectonics and Pangea. (4a)
6. Evidence of Pangea
A. The continents fit
together like puzzle
pieces.
B. Identical plant and
animal fossils of the
same age have been
found in rocks in Africa
and South America.
Guided Practice
1. Does the picture at the
right show Pangea?
2. What motion of the
mantle and
asthenosphere has
caused the continents to
move?
Do you know what that means?
(5 questions)
1. The lithosphere is broken into different
pieces that move over time. What are
these pieces called?
Pangea
B. Tectonic Plates
C. Fossils
D. Supercontinents
A.
2. Which distance below could be the
distance that a piece of the lithosphere
would move in one year?
It could move 5 millimeters
B. It could move 12 meters
C. It could move 5 centimeters
D. It could move 12 kilometers
A.
3. A force causes the pieces of Earth’s lithosphere to
move. What causes this force and where does it
occur?
A. Jet streams in the California Current and Gulf
Stream Current.
B. Jet streams in the troposphere and
stratosphere.
C. Convection currents in the inner and outer core
D. Convection currents in the mantle and
asthenosphere.
4. What is Pangea?
A. The idea that the continents are moving
closer together.
B. The idea that the continents are moving
apart.
C. The idea that the continents were once all
connected.
D. The idea that the continents never move.
5. Which of these gives evidence for the existence
of Pangea?
A.
B.
C.
D.
The coastlines of the continents do not fit
together.
The continents have remained in place for millions
of years.
Fossils of the same animal were found on two
different continents.
Fossils of two different animals were found on two
different continents.