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Transcript
Earth’s 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 Earth’s 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 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 LOOK AT THE SMARTBOARD Divergent Boundary - Continental LOOK AT THE SMARTBOARD 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 www.geology.com Review • Name the 3 main layers of the Earth • What is a tectonic plate? • Name the three different types of plate boundaries and one location on Earth for each one Review • Name the 3 main layers of the Earth – Crust, mantle, core • What is a tectonic plate? – Pieces of the lithosphere that move around • Name the three different types of plate boundaries and one location on Earth for each one – Divergent, Convergent & transform What type of boundary is this? What type of boundary is this? What type of plate boundary is this?
