Plate Tectonics

Alfred Wegener:  He was known for purposing the theory of the Continental drift in the 20th century

Convergent boundaries: as an active region where 2 or more plates or fragments of the lithosphere move toward one another and collide

Divergent boundaries: a linear feature that is between two tectonics plates that are moving away from each other

Transform boundaries: where two tectonic plates float alongside each other and when they scrape each other it causes earthquake

Juan De Fuca Plate is right off the coast of Washington

Under the Cascades, a dense oceanic plate is sucked under the North American Plate; a process known as subduction. As the oceanic slab sinks deep into the Earth's interior beneath the continental plate, high temperatures and pressures allow water molecules locked in the minerals of solid rock to escape. The water vapor rises into the pliable mantle above the subducting plate, causing some of the mantle to melt. This newly formed magma rises toward the Earth's surface to erupt, forming a chain of volcanoes (the Cascade Range) above the subduction zone.

Convection currents under the Earth's surface may cause magma to rise, which causes the sea floor to spread apart

Channeled Scablands are a barren, relatively soil free landscape in eastern Washington, scoured clean by a flood unleashed when a large glacial lake drained. They are a geologically unique erosional feature in the U.S state of Washington

#platetectonics #rockinreview