Plate Tectonics Day3

Review

• Plate tectonic Theoryhttp://www.odsn.de/odsn/services/paleomap/animation.html

• Surface of earth made of rigid “plates” • Float on asthenosphere and is in constant motion• Explains

Drifting continents

Mountain building

Earthquakes

Volcanic activity

Convection Currents and the Mantle

Effects of crustal plate movement!

Constructive ForcesHelp build land

There are 3Types of Boundaries

Click picture for video

http://www.learner.org/interactives/dynamicearth/plate.html

Convergent Boundaries http://www.learner.org/interactives/dynamicearth/slip2.html

• Boundaries between two plates that are colliding

Subduction http://www.learner.org/interactives/dynamicearth/slip2.html

oceanic plates collide with continental plates, and slide beneath them creating trenches.

Ex. Mt. St. Helens•http://player.discoveryeducation.com/index.cfm?guidAssetId=489D30FF-EC27-483E-825D-A5FA582A57E4

The ocean floor plunges into deep underwater canyons called deep-ocean trenches.

Subduction takes place in deep-ocean trenches. Subduction is the process by which the ocean

floor sinks beneath a deep-ocean trench and back into the mantle.

The RING of fireClick on picture

Hot Spots

hot material rises up through the mantle, heats up the lithosphere and forms a volcano.

Once the plate passes over this hotspot, the volcano becomes inactive.

Ex. Hawaiihttp://player.discoveryeducation.com/index.cfm?guidAssetId=C485747E-A115-41D6-9D42-D6FFE6CA3914

Discovery Educationhttp://player.discoveryeducation.com/index.cfm?guidAssetId=8565EFBE-6F25-42BF-A60C-0BEA7F34ADCA

Mount Nyiragongo VideoLife near the volcano

http://youtu.be/rZLSvO6vJZ0More videos-no sound

http://youtu.be/W_meqhjQxb8

http://youtu.be/6qMYmNg6K_8