SBSK+1.5

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Vocabulary

 * scientific theory**-well-tested concept that explains a wide-range of observations
 * Plate Tectonics**-geological theory that states that pieces of Earth's Lithosphere are in constant,slow motion,driven by convection currents in the mantle
 * Plates**-the Lithosphere broken into seperate sections
 * Faults-**breaks in the Earth's crust where rocks have slipped past each other
 * Transform Boundary-**a place where two plates slip past each other
 * Divergent Boundary**-a place where 2 plates move apart
 * Convergent Boundary**-a place where 2 plates come together
 * rift valley**-forms along a divergent boundary

Intro

 * J.Tuzo Wilson observed that there are cracks in the continents similar to those on the ocean floor
 * the lithosphere has been broken into seperate sections called plates

The theory of Plate Motion

 * The theory of plate tectonics explains the formation,movement, and Subduction of Earth's plates

Plate Boundaries

 * Transform boundaries
 * Earthquakes occur frequently along these boundaries
 * Divergent boundaries
 * these boundaries mostly occur on the mid-ocean ridge and sometimes on land
 * Convergent boundaries
 * these boundaries occur on land
 * three types of convergent boundaries:continental crust and oceanic crust,Oceanic crust and oceanic crust,continental crust and continental crust

The Continents' Slow Dance

 * plates move about 1-10 cm.each year

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