Plate Tectonics - Broward County Public Schools

Plate Tectonics - Broward County Public Schools

Plate Tectonics Liz LaRosa for use with my Science Class http://www.middleschoolscience.com 2009 Earths Layers The Earth's rocky outer crust

solidified billions of years ago, soon after the Earth formed. This crust is not a solid shell; it is broken up into

huge, thick plates that drift atop the soft, underlying mantle. The Crust

Outermost layer 5 100 km thick Made of Oxygen, Silicon, Aluminum The Mantle Layer of Earth between the crust

and the core Contains most of the Earths mass Has more magnesium and less aluminum and silicon than the crust

Is denser than the crust The Core Below the mantle and to the center of the Earth

Believed to be mostly Iron, smaller amounts of Nickel, almost no Oxygen, Silicon, Aluminum, or Magnesium

Tectonic Plates 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 Alfred Wegener 1900s Continents 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 http://members.enchantedlearning.com/subjects/astronomy/planets/earth/ Continents.shtml

Evidence of Pangea Sea Floor Spreading Sea Floor Spreading Mid Ocean Ridges underwater mountain chains that run through the Earths Basins

Magma rises to the surface and solidifies and new crust forms Older Crust is pushed farther 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 Divergent Boundary Iceland http://pubs.usgs.gov/gip/dynamic/understanding.html

Divergent Boundary - Oceanic http://www.geology.com Divergent Boundary - Continental http://www.geology.com

Convergent Boundary Indian and Eurasian Plates Convergent Boundary Oceanic & Continental http://pubs.usgs.gov/gip/dynamic/understanding.html & http://www.geology.com

Convergent Boundary Oceanic & Oceanic http://pubs.usgs.gov/gip/dynamic/understanding.html & http://www.geology.com Convergent Boundaries - Continental http://pubs.usgs.gov/gip/dynamic/understanding.html & http://www.geology.com

Transform Boundary San Andreas Fault United States California www.geology.com

Review

Name the 3 main layers of the Earth What is a tectonic plate? What was Pangea? What is Sea-Floor spreading? Name the three different types of plate boundaries and one location on Earth for each

one

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