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Lesson 6

Continental Drift, Earthquakes
         & Volcanoes
Learning Outcomes
You will be successful if you can:

• Describe the reasons as to why earthquakes
  and volcanoes are unp...
The Earth’s outer layer is
made up of a dozen giant
SLABS of rock, and some
smaller ones.
These are called TECTONIC
PLATES.
There are more than 30 000 earthquakes
every year!
Usually ONE
of these is
very
destructive.




  KOBE, Japan
  1995
The tectonic plates can move in 3 ways:

MOVE AWAY from          Earthquakes are common at all
each other. Usually     mov...
Destructive   Constructive
margin           margin
A volcano is a vent (or valve) in the
Earths surface. It erupts magma,
which forms lava or ash.

  They are also
  common ...
Review
Crust           Mantle        Core
Heat            Low density   Tectonic plates
Africa          S America     Rock...
Homework
Complete the Geohazards project on
 Uniservity
E&U L6
E&U L6
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E&U L6

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Transcript of "E&U L6"

  1. 1. Lesson 6 Continental Drift, Earthquakes & Volcanoes
  2. 2. Learning Outcomes You will be successful if you can: • Describe the reasons as to why earthquakes and volcanoes are unpredictable. • Recall that earthquakes, volcanoes and mountain building occur at the edges of tectonic plates. • Be able to describe how the movement of tectonic plates contribute to the rock cycle.
  3. 3. The Earth’s outer layer is made up of a dozen giant SLABS of rock, and some smaller ones. These are called TECTONIC PLATES.
  4. 4. There are more than 30 000 earthquakes every year! Usually ONE of these is very destructive. KOBE, Japan 1995
  5. 5. The tectonic plates can move in 3 ways: MOVE AWAY from Earthquakes are common at all each other. Usually moving plate boundaries. The under the sea, at most destructive happen at OCEANIC RIDGES. subduction boundaries: these may cause TSUNAMIS. PUSH TOGETHER in a squashing movement, making mountains like the Himalayas. SLIDE PAST each other, like the San Andreas fault in California.
  6. 6. Destructive Constructive margin margin
  7. 7. A volcano is a vent (or valve) in the Earths surface. It erupts magma, which forms lava or ash. They are also common at PLATE BOUNDARIES, where the Earth’s crust is stretched, compressed or uplifted.
  8. 8. Review Crust Mantle Core Heat Low density Tectonic plates Africa S America Rock types Oceanic Plate Fossils High Density Subduction Earthquakes Magnetic Continental Radioactive reversal plate Decay pattern
  9. 9. Homework Complete the Geohazards project on Uniservity
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