Vocabulary

 3 Types: 1. Oceanic – Oceanic 2. Continental – Continental 3. Continental – Oceanic  Definition The boundary formed by the collision of 2 lithospheric plates.

 Definition The boundary between 2 tectonic plates that are moving away from each other.  Effect Sea Floor Spreading at a Mid- Ocean Ridge

 Definition The boundary between 2 tectonic plates that are sliding past each other horizontally.  Effect Earthquakes!!!!!

 Types 1. Reverse Fault 2. Strike – Slip Fault 3. Normal Fault  Definition A break in a body of rock along which one body of rock slides relative to another.

 Definition Pieces of the lithosphere that move around on top of the asthenosphere.

 Definition The solid outer layer of the earth that consists of the crust and the rigid upper part of the mantle.  Divided into tectonic plates.

 Definition The body of molten rock that feeds a volcano

 Definition The soft, plastic layer of the mantle on which the tectonic plates move because of heat that causes convection currents.  It causes the tectonic plates to move.

 Definition The shaking of the ground  Measured by seismic waves  Forms at transform boundaries

 Definition A vent or fissure in the earth’s surface through which magma and volcanic gases are expelled.  Forms at Convergent boundaries

 Definition The theory that explains how large pieces of the earth’s outermost layer called tectonic plates move on the asthenosphere and change shape.

 Definition The tectonically active volcanoes that formed to surround the Pacific ocean. Indonesian Islands, Phillipino Islands, Japan

 Definition The hypothesis that states that the continents once formed a single landmass called Pangaea, broke apart, and drifted to their present locations.  Who came up with it? Alfred Wegener

 Definition The process by which new oceanic lithosphere forms as magma rises toward the surface and solidifies.  Occurs at divergent boundaries

 Definition The lithosphere sinks under another plate. Old oceanic crust gets pushed down into the asthenosphere where it is re- melted and recycled.  Causes volcanoes to form.  Occurs at convergent boundaries.