Alfred Wegener: Noticed similarities in the shoreline of continent on both sides of the Atlantic Ocean, he then began fitting them together. Introduced.

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Presentation transcript:

Alfred Wegener: Noticed similarities in the shoreline of continent on both sides of the Atlantic Ocean, he then began fitting them together. Introduced the hypothesis of continental drift. Suggested a supercontinent, called Pangaea (meaning "all land"), that broke up millions of years ago, slowly moved to their current positions, and continue to move today.

DIVERGENT- When two plates move away from each other. Characteristics: Mid – ocean ridges (underwater mountain ranges) Rift Valleys (narrow valleys that form where plates separate), Newest rock material (cooling magma forms new oceanic crust).

DIVERGENT Ex: Seafloor Spreading

CONVERGENT – When two plates collide. Characteristics: Mountains, most earthquakes, Volcanoes, and trenches 1.ocean – ocean 2.ocean – continent 3.continent – continent CONVERGENT

TRANSFORM – When two plates are moving past each other. Characteristics: San Andreas Boundary

The Pacific plate and North American plate grind past each other side by side.

AREA WITHIN A PLATE WHERE MAGMA WORKS ITSELF TO THE SURFACE ARE CALLED HOT SPOTS. HOT SPOTS ARE STATIONARY SO WHEN THE PLATE ABOVE IT MOVES A NEW VOLCANOE FORMS.