Download Plate Tectonics and Igneous Rocks

Plate Tectonics and
Igneous Rocks
Earth is made of layers
The Earth is a puzzle made up of
multiple plates.
Convection is the driving force for
plate motion.
Moving plates can have devastating
consequences.
Japan March 11, 2011
Convergent Plate boundaries are sites
of earthquakes and volcanic activity.
Divergent Plate boundaries are sources of
earthquake and volcanic activity.
Transform Plate boundaries are
sources of earthquakes.
Juan de Fuca Plate in California
All three boundaries interact with one
another.
http://www.youtube.com/watch?v=ryrXAGY1dmE&feature=related
Types of Plate Boundaries (describe the motion):
Convergent-
When two plates collide
Divergent-
When two plates move apart or divide
Transform-
When two plates slide past each other
What is the cause for plate motion?
Heat from the earth’s core causing convection currents
What is convection?
When molten rock heats and rises, and then cools and sinks back down
creating a convection cell.
Plate activity can generate rocks.
Igneous Rocks are found at or near volcanoes!!
Igneous Rocks Come from Magma.
Extrusive
Lava
Magma
Intrusive
The type of rock depends on the rate of
cooling.
Intrusive Rocks cool slowly and
form large crystals.
Granite
Diorite
Gabbro
Formation?
Intrusive rocks form from cooled magma (below the surface).
Extrusive Rocks cool rapidly and form small crystals.
Obsidian
Basalt
Rhyolite
Formation?
Pumice/Scoria
Extrusive Rocks form
from cooled lava (above
Earth's surface).
Jig-Saw Activity
Exit Card
What is the driving force for plate motion?
Where are igneous rocks found?
What is the difference between intrusive and
extrusive igneous rocks?
Give an example of an extrusive and
intrusive igneous rocks.