Plate Tectonics.

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Plate Tectonics Liz LaRosa for use with my 5th Grade Science Class
Plate Tectonics Liz LaRosa for use with my 5th Grade Science Class
Plate Tectonics Liz LaRosa for use with my 5th Grade Science Class
Presentation transcript:

Plate Tectonics

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

Activities

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 Animation

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 Convection Video

Different Types of Boundaries

How Plates Move and Interact Divergent Boundaries – Pulling Apart Convergent Boundaries – Pushing Together Transform Boundaries – Push Opposite Directions

What kind of boundary is this? DIVERGENT Arabian Plate Red Sea African Plate

What kind of Boundary is this? DIVERGENT

What Kind of Boundary is this? Convergent Eurasian Plate Indian Plate

Convergent Boundary MOUNTAIN BUILDING

Transform Boundary – San Andreas Fault

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