Review for Geology Plate Boundaries Convergent two plates

Review for Geology

Plate Boundaries • Convergent: two plates moving toward each other – Oceanic-oceanic, oceanic-continental, continental – Oceanic-continental and oceanic-oceanic both subduct – Underwater volcano, sometimes earthquakes, mountains, valleys/trenches,

• Fault/Transform – They slide past each other – Earthquakes are the result • Divergent: 2 plates moving away from each other – Mountains and volcanoes form

Volcanoes Cinder Cone • Explosive • Shoots out ash and hot molten rocks • Steep and tall Shield Volcano • Lava comes out slowly – not explosive • Small and wide/looks like a shield • Lava goes in one direction • Shield volcano does not shoot out ash

Volcanoes Continued • A mountain that contains magma and explodes from time to time • The pressure and heat involved with tectonic plate movements • Earthquakes happen before a volcano erupts

Earthquakes • When the earth shakes because tectonic plates are moving along a fault • Primary wave is the first wave like rings or ripples • Secondary wave is slower than the primary wave – looks like a wave, snake • Focus – where an earthquake begins – or starting point – located under the fault line (underground) • Epicenter – where the most damage occurs and where the earthquake is strongest • Fault – break in earth’s crust along which movement of tectonic plates occurs