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TYPES OF PLATE MOVEMENTIf plates can move apart, what other types of movement are possible?
Moving toward each other; Moving underneath another; Moving up or down relative to the other.
ADD TO YOUR VOCAB SHEET:Page Word Definition Sketch/Example
Divergence Plates moving away from each other.
South America is moving away from Africa
Convergence
Plates moving toward each other.
Juan de Fuca Plate is moving below North American Plate
Transform Plates moving north or south relative to each other.
The Pacific Plate is moving north relative to the North American Plate.
WHAT EFFECTS CAN PLATE TECTONICS HAVE ON GEOGRAPHY?
Build volcanoes when one plate “subducts” under another:
THAT’S HOW WE GOT OUR COASTAL VOLCANOES, (NOW MOUNTAINS):
OUR VOLCANOES ARE NOW DORMANT, SO WE CONSIDER THEM JUST “MOUNTAINS.”
Eg: Garibaldi, Mount Baker, Mount Saint Helen’s.
“SUBDUCTION:” “SUB” AS IN “BELOW”
WHEN PLATES COME TOGETHER, BUT THEY’RE OF SIMILAR THICKNESS AND WEIGHT, ONE DOESN’T SINK BELOW THE OTHER. INSTEAD…
The continental crusts push upward, forming…
Mountains.
INDIA WASN’T ALWAYS ATTACHED TO EURASIA
MOUNT EVEREST, THE TALLEST MOUNTAIN IN THE WORLD, IS THE RESULT: 8,848 M
WHAT HAPPENS AT TRANSFORM BOUNDARIES?
Tension builds, then every once in a while, there is …
An earthquake
You can see the San Andreas Fault from the air:
NOTE THE LATERAL MOVEMENT OF ONE SIDE OF THE FIELD COMPARED TO THE OTHER:
ADD THE RED WORDS TO YOUR VOCAB SHEET:
Page Word Definition Sketch/Example
Divergence Plates moving away from each other. Causes “new land.”
South America is moving away from Africa
Convergence
Plates moving toward each other. Causes volcanoes when subducting; causes mountains when both plates rise together.
Juan de Fuca Plate is moving below North American Plate
Transform Plates moving north or south relative to each other. Causes earthquakes
The Pacific Plate is moving north relative to the North American Plate.
YOUTUBE:THE EARTH 650,000,000 YEARS AGO TO 250,000,000+ YEARS AGO.
FREE APP TO OBSERVE PLATE TECTONICS FORWARDS AND BACKWARDS AT YOUR OWN PACE: EARTHVIEWER
This website allows you to drag continents around, (need “Shockwave installed.)
http://www.pbs.org/wgbh/aso/tryit/tectonics/#
