Plate Tectonics Slide 2 The Earths 4 Layers 1.Inner Core:
Center, made of solid iron and nickel. 1200 km 2.Outer Core: Made
of liquid iron and nickel. 2250 km 3.Mantle: Rich in iron,
magnesium, and silicon. Melted at shallower levels. 2900 km
4.Crust: Solid rock, 10-65 km Slide 3 The Crust Made of a number of
rigid, but moving plates. Plate Tectonics: The study of the
formation and movement of these plates. Slide 4 Why do the plates
move? The plates are part of the lithosphere Lithosphere: The crust
and uppermost part of the mantle. The lithosphere rests on top of
the asthenosphere, made of partially melted rock. This allows it to
move slowly and form convection currents Slide 5 Rising of warm
material and sinking of cold material in a cycle Convection
Currents Slide 6 Evidence for Plate Tectonics Continental Drift:
Alfred Wegener, proposed continents were once a super continent
(Pangaea) Certain coast lines fit together like puzzle pieces Slide
7 Slide 8 Continental Drift Fossils of animals are found on
separate continents Slide 9 Slide 10 Plate Types 2 different plate
types: Oceanic: When a plate is under the ocean. Pacific Plate
Nazca Plate Continental: When a plate has land on it. Antarctic
Plate Eurasian Plate Some plate have oceanic and continental areas:
North American Plate Indian Plate Slide 11 Slide 12 3 Plate
Boundaries Diverging: Plates move away from each other. Converging:
Plates come together. Sliding/Transform: Plates move past each
other. Slide 13 Diverging Boundaries Most occur at crests of
oceanic ridges Constructive Plate Margins Slide 14 Oceanic Ridge
Forms seafloor is elevated The ridges have deep valleys in them
called rift- valleys, the place where new rocks form Seafloor
Spreading plate tectonics produce new oceanic lithosphere.
Diverging Boundaries Slide 15 Slide 16 Converging Boundaries 3
converging boundary types Continental-Continental collision
boundary Continental-Oceanic Oceanic-Oceanic subduction boundary
Slide 17 Form larger continent Forms Mountain Ranges Destroys Ocean
Floor Converging Boundaries Continental-Continental Collision
Boundary Slide 18 One plate is pushed underneath the overriding
plate Create deep-sea trenches Ocean crust is destroyed. Form
Volcanoes Converging Boundaries Subduction Boundaries Slide 19
Subduction: Ocean to Ocean Slide 20 Slide 21 Subduction: Ocean to
Land Slide 22 Slide 23 Transform/Sliding Faults Create a fault: a
break or crack in the crust along which movement occurs.
