Plate Tectonics Liz La Rosa for use with
- Slides: 23
Plate Tectonics Liz La. Rosa for use with my 5 th Grade Science Class http: //www. middleschoolscience. com 2009
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
Continental Drift Alfred Wegener 1900’s 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 Earth’s 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 Arabian Plate Red Sea African Plate
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 Eurasian Plate Indian Plate
Convergent Boundary – Oceanic & Continental http: //pubs. usgs. gov/gip/dynamic/understanding. html & http: //www. geology. com
Convergent Boundary – Oceanic & Oceanic NOTE – PLATES ARE REVERSED 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? What was Pangea? What is Sea-Floor spreading? Name three different types of plate boundaries and one location on Earth for each one
- Plate tectonics vs continental drift
- Convergent boundary
- Evidence of the theory of plate tectonics
- The plate tectonics theory states that:
- Convergent boundary divergent boundary transform boundary
- Compare continental drift and plate tectonics
- Plate tectonics webquest answers
- Plate tectonics vocabulary worksheet
- Continental drift
- Seafloor spreading material at trenches
- Plate tectonics definition
- Driving force of plate tectonics
- Concept map plate tectonics
- Summarize the theory of plate tectonics
- Harry hess and seafloor spreading
- Continental drift vs plate tectonics
- Plate tectonics test review answer key
- Constructive plate boundary diagram
- Divergent boundary oreo
- Pangaea
- The ocean floor revealing plate tectonics
- Chapter 10 plate tectonics
- Plate tectonics definition apes
- Francis bacon plate tectonics