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Presentation transcript:

Magnetic striping

Four types of plate boundaries: Divergent boundaries -- where new crust is generated as the plates pull away from each other. Convergent boundaries -- where crust is destroyed as one plate dives under another. Transform boundaries -- where crust is neither produced nor destroyed as the plates slide horizontally past each other. Plate boundary zones -- broad belts in which boundaries are not well defined and the effects of plate interaction are unclear.

Divergent boundaries

Map of East Africa showing some of the historically active volcanoes (red triangles) and the Afar Triangle (shaded, center) -- a so-called triple junction (or triple point), where three plates are pulling away from one another: the Arabian Plate, and the two parts of the African Plate (the Nubian and the Somalian) splitting along the East African Rift Zone.

References and Resources “This Dynamic Earth: The Story of Plate Tectonics” W. Jacquelyne Kious & Robert I. Tilling This Dynamic Planet (interactive world map) This Dynamic Planet: A Teaching Companion Plate Tectonics Animations