Inside Earth Chapter 1.5 Pages 42-47 Plate Tectonics Review Sea-floor Spreading and the convection process – have students explain Mid-ocean ridge and Deep-sea trenches (what is Subduction?) What is a plate? Dinner Plate, Home Plate, metal plates… etc. Inside Earth Chapter 1.5 Pages 42-47

Cracks in the Earth

Plate Tectonics Scientist J. Tuzo Wilson in 1965 combined Continental Drift & Sea-Floor Spreading, creating… Theory of Plate Tectonics: plates (pieces of Earth’s lithosphere) are in constant, slow motion, driven by convection currents in the mantle.

Earth’s Plates

Climate Recall the Crust There are 3 types of boundaries in Plate Tectonic Theory Convergent Divergent Transform Each boundary creates a geologic feature depending on the type of crust involved Continental Oceanic

Convergent Boundaries Climate Definition: two plates move towards each other. (Collision Boundary) What geologic features do Continental crust collisions create?

Convergent Boundaries Geologic Features: Cont/Cont collision forms mountains (Himalayas)

Convergent Boundaries Geologic Features: Cont/Ocean (Subduction boundary) Denser Ocean plate subducts Trenches, Volcanoes Example: Mt. St. Helens

Convergent Boundaries Geologic Features: Ocean/Ocean (Subduction boundary) Denser Ocean plate subducts Trenches, Volcanic Island Arc Example: Hawaii

Climate Divergent Boundaries Definition: two plates moving apart Geologic Features: forms a rift valley Examples: Great Rift Valley Mid-Ocean Ridge

Climate Transform Boundaries Definition: Two plates slide past each other in opposite directions Geologic Features: Faults: break in crust Examples: San Andreas Fault Causes earthquakes North American Plate Pacific Plate

Climate Boundary Diagrams Boundary: Motion: Features formed: Examples: Boundary: Transform Motion: Slide past each other Features formed: Fault Examples: San Andreas Fault

Climate Boundary Diagrams Cont. Crust Boundary: Motion: Crust: Features formed: Boundary: Convergent Motion: Towards each other Crust: Continental & Continental Features formed: Mountain ranges Cont. Crust

Boundary Diagrams Boundary Diagrams Motion: Features formed: Boundary: Divergent Motion: Pull apart, move away Features formed: Mid-Ocean Ridge

Climate Boundary Diagrams Boundary: Motion: Crust: Features formed: Boundary: Convergent Motion: Towards each other Crust: Oceanic & Oceanic Features formed: Subduction, Trench, Volcanic island arc

Climate Boundary Diagrams Boundary: Motion: Features formed: Example: Boundary: Divergent Motion: Pull apart, move away Features formed: Rift Valley Example: Great Rift Valley

Climate Boundary Diagrams Boundary: Motion: Crust: Features formed: Boundary: Convergent Motion: Towards each other Crust: Oceanic & Continental Features formed: Subduction, Trench, Volcanoes