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Tectonic Plates
Directions:
• Use this PowerPoint to guide you through making your illustrations and information for your notes page.
• When you finish your notes page, write and answer the review questions at the end of the PowerPoint in your CNB.
Plate Tectonics
• Greek – “tektonikos” of a builder• Pieces of the lithosphere that move around• Each plate has a name• Fit together like jigsaw puzzles• Float on top of mantle similar to ice cubes
in a bowl of water
Continental Drift
http://members.enchantedlearning.com/subjects/astronomy/planets/earth/Continents.shtml
Alfred Wegener 1900’sContinents were once a single land mass that drifted apart.
Fossils of the same plants and animals are found on different continents
Called this supercontinent Pangea, Greek for “all Earth”
245 Million years ago
Split again – Laurasia & Gondwana 180 million years ago
Evidence of Pangea
Sea Floor Spreading
Sea Floor Spreading
• Mid Ocean Ridges – underwater mountain chains that run through the Earth’s Basins
• Magma rises to the surface and solidifies and new crust forms
• Older Crust is pushedfarther away from the ridge
How Plates Move
http://pubs.usgs.gov/gip/dynamic/unanswered.html
Different Types of Boundaries
http://pubs.usgs.gov/gip/dynamic/understanding.html
Divergent Boundary – Arabian and African Plates
Arabian Plate
African Plate
Red Sea
Divergent Boundary – Iceland
http://pubs.usgs.gov/gip/dynamic/understanding.html
Divergent Boundary - Oceanic
Click here to discover the type of land formation created
Divergent Boundary - Continental
Click here to discover the type of land formation created
Convergent Boundary – Indian and Eurasian Plates
Indian Plate
Eurasian Plate
Convergent Boundary – Oceanic & Continental
http://pubs.usgs.gov/gip/dynamic/understanding.html & http://www.geology.com
Click here for land formations
Convergent Boundary – Oceanic & Oceanic
http://pubs.usgs.gov/gip/dynamic/understanding.html & http://www.geology.com
NOTE – PLATES ARE REVERSED
Click here for land formations
Convergent Boundaries - Continental
http://pubs.usgs.gov/gip/dynamic/understanding.html & http://www.geology.com
Click here for land formations
Transform Boundary – San Andreas Fault
Click here for results of transform boundaries
ReviewComplete this review when you finish your notes and illustrations page.
1. Name the 3 main layers of the Earth.2. Which layer makes up most of the Earth’s
mass/size?3. What is a tectonic plate?4. What was Pangea?5. What is Sea-Floor spreading?6. Name the three different main types of plate
boundaries and one location on Earth for each one.