Plate Tectonics

Wilson- combined Continental Drift, Sea- Floor Spreading. A geologic theory that states that pieces of Earth’s lithosphere are in constant, slow motion driven by convection currents in the mantle. Plate Tectonics CD Rift Evidence

Earth’s Plates CD Rift Evidence

Climate Convergent Boundaries Definition: Two plates move towards each other. (Collision Boundary) Other Info: – Density plays a role. – Effect on Crust: Cont/Cont Collision creates mountains Subduction- destroys ocean crust.

Geologic Features: – Cont/Cont- Forms Mountains- Himalayas Convergent Boundaries

Geologic Features: – Ocean/Ocean (Subduction boundary) Denser Ocean plate subducts. – Deep sea-trenches, Volcanic Island Arc – Cont/Ocean (Subduction boundary) Denser Ocean plate subducts. – Deep sea-trenches, Volcanoes (Mt. St. Helens) Convergent Boundaries

Definition- Two plates pull apart. Motion: Geologic Features- Forms a rift valley. Other Info- – Great Rift Valley – Mid-Ocean Ridge Climate Divergent Boundaries

Geologic Features- – Forms a rift valley. Chain of volcanoes – Creates new ocean floor. Other Info- – Great Rift Valley – Mid-Ocean Ridge Divergent Boundaries

Two plates slide past each other in opposite directions. Motion of Plates: Geologic Features: – Faults- break in crust Other Info: – San Andreas Fault – Causes Earthquakes Climate Transform Boundaries Pacific Plate North American Plate

Climate Boundary Diagrams Boundary: – Transform Examples: – San Andres Fault Motion: – slide past each other. Features formed: – Fault

Boundary: – Divergent Example: – Mid-Atlantic Ridge Motion: – Pull apart, move away Features formed: – Mid-Ocean Ridge Underwater Volcanoes Boundary Diagrams

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

Divergent Boundary

Climate Boundary Diagrams Boundary: Convergent Examples: Himalaya, Mts. Motion: Towards each other Features formed: Mt. Ranges

Climate Boundary Diagrams Boundary: Convergent Examples: – Japan. – Aleutian Islands Motion: – Towards each other Features formed: – Subduction, Trench, Volcanic island arc

Climate Boundary Diagrams Boundary: Convergent Examples: – Mt. St. Helens Motion: – Towards each other Features formed: – Subduction, Trench, Volcanoes