Download Chapter 2 – 2 Forces Shaping Earth

Chapter 2 – 2 Forces
Shaping Earth
World Geography
Review From Yesterday
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What do you remember about the
revolution of the earth?
What do you remember about days and
nights?
How does latitude affect the seasons?
On a ½ piece of paper
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Online Latitude Quiz
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Not graded but do you must do your best!
Today, you will learn…
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Today you will be learning about the
forces that shape our planet Earth, both
inside and out.
You will also learn about the different
layers that make up the earth.
What exactly is plate tectonics?
The Pacific Ring of Fire
This is a
great
example
of the
forces
that are
currently
shaping
our
planet
earth.
What does the earth look like on
the inside?
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An easy way to think of the
inside of the earth is to
imagine that the earth is a
giant gobstopper with many
different layers, flavors, and
colors.
A) Earth’s Layers
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1) The core is a sphere of very
hot metal at the center of the
earth.
2) The mantle is a thick, hot,
rocky layer surrounding the core.
3) The crust is the thin layer of
rocks, and minerals that
surround and float on the
mantle.
Layers of
Inner
Earth
B) Water
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1) 70% of the earth’s
surface is water
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Lakes, rivers, seas,
oceans.
30% is land
2) 97% of water is in
oceans
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3% of world
freshwater.
Get it?
C) Forces Inside Earth
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1) Heat deep inside
Earth is constantly
reshaping the planet
2) The earth is made
up of moving plates
of land that “float” on
magma.
Just like boiling water,
magma bubbles to the
surface of the earth
Earth’s Moving
Tectonic Plates
Through Time
Bilions of years ago, all continents
were connected in a supercontinent
named Pangea
Website
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Pangea Website
D) Volcanoes and Earthquakes
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1) Volcanoes are formed
by two tectonic plates
colliding and one plate
sliding under another
plate.
2) Earthquakes are
caused when two plates
push into each other.
World Seismicity 1978 - 1987
Notice how all earthquakes
have occurred along plate
boundaries!
E) Forces on Earth’s Surface
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Forces inside the earth
create.
Forces on the outer part
of the earth wear earth
down and reshape it.
1) Weathering is a
process that breaks rocks
down into tiny pieces.
2) Erosion is the removal
of small pieces of rock by
water, ice and wind.
Website
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Layers of the Earth Website - CNN