Transcript WELCOME BACK! - Year 6 and 7 Mathematics, Science and

Today:
 Continental Drift Theory-Quick Review
 Plate Tectonics
 Video
 Reading comprehension worksheet
Continental Drift Quick Check –
True or False
1.
2.
3.
4.
5.
Around 225 million years ago, earth was one big land
mass called Gondwanaland.
False
Alfred Wegner’s came up with the Tectonic Plate Theory.
False
Evidence to support Wegner’s theory was the continents
fitting together like a jig-saw puzzle.
True
Convective flow in the mantle is responsible for the
movement of the plates found on Earth.
True
Our Earth used to be two supercontinents called
Pangaea meaning “all Earth” .
3
False
The Himalayas are growing in
height, Iceland is splitting in
half, new rock is forming in
the middle of the Earth’s
ocean and our homes are
moving each and every day...
WHY???
Questions to ponder?
1) Looking at the picture below, do you think our Earth
always looked like this? Explain
Plate Tectonic Theory:
 Earth is NOT one big solid rock
 Earth is broken down into large and small pieces of rock
(like a broken plate)
 The lithosphere is broken down into many large rigid slabs
of rock (or plates) that move apart and than rejoin.
 Movement of these plates ride on the asthenosphere and
can create mountains, cause earth quakes, volcanoes, and
tsunamis.
The surface of the Earth is made up of solid
but moving pieces of rock
Lithosphere =
Crust + upper mantle
Asthenosphere =
A partially molten part of
the upper mantle
Lithospheric plates =
A rocky solid layer is broken
into rigid masses
Theory of Plate tectonics =
Lithospheric plates move
around on fluid
asthenosphere and interact
with others.
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Homework:
 Complete reading comprehension worksheet