Download 2.9 Building the Earth

Building the Earth
(red: copy in your notes)
The earth with no water
The earth no water and no
vegetation (dried out)
Conclusions from these pictures
• mountains and deep valleys on ocean
floors
• Water covers most of the earth
• No water-no life
The earth is like an egg
Cross-section of the earth
• Crust:
– 8-64kms thick
– cold and fragile
– Granite and Basalt
• Mantle:
– 1800km thick
– hot and molten
– Magnesium and Silicon
• Outter Core:
– 2000kms thick
– 3000-4000 degrees C
– liquid Nickel and Iron
• Inner Core:
– 1400km thick
– 5000-6000 degress C
– solid Nickel and Iron
7
Canada is located on the North
American Plate
YOU TRY IT!
• In partners, line
up your OPEN
binder against the
OPEN binder of
your partner
• NOW PUSH THE
BINDERS
TOGETHER!
What happened?
• One binder slipped under
• One binder buckled up – This is how
fold mountains are created
Plates
• Large slabs of rock that cover the
earth’s crust
• They move because of plate tectonics
Plates move to build mountains
Convection currents act like
boiling water
At weak points of the earth’s crust….the mantle
pops through. This creates a VOLCANO.
Seismologist
• A scientist who
studies
earthquakes
and volcanoes
Ring of Fire
Earthquakes and volcanoes
occur at the edge of plates