An overview of plate tectonics

convergent boundries

Oceanic crust is dencer than continental crust. When a continental plate and an oceanic plate collide, the oceanic plate gets pushed bellow the continental plate, this is called subduction. At convergent boundaries, trenches form.

asthenosphere

The layer of soft but solid mobile rock found below the lithosphere. The _______________ begins about 100 km below Earth's surface and extends to a depth of about 350 km; the lower part of the upper mantle.

An overview of plate tectonics

The overmost section of the planet, consistng of Earth's crust and upper mantle, is called the lithosphere. The lithosphere is broken up into several large pieces and many smaller ones called tectonic plates. The plates beneath the Earth are called continental plates, while those below the ocean are called ocieanic plates.

Tectonic plates and bondries

The theory of plate tectonics describe how Earth's tectonc plates move over time. As mantle rock above heats up, it rises and, as it moves away from the heat source, it gradually cools and sinks.Many geological fetures such as earthquakes, trenches,mountains, and volcanos. There are three main types of boundries, divergent, convergent, and transform. at divergent boundries, plates move apart, at convergent boundries plates move tward each other, and ate trancform boundries, plates slide past each other, creating earthquakes.

Transform boundries

Transform boundaries occur where two plates slide against each other. Large Earthquakes often occur at transform boundaries. One example is at the San Andreas fault in California.

Divergent boundries

Where oceanic plates move appart, magma flows from the mantle to the Earth's surface. The molten rock cools in the ocean water, forming new oceanic crust, this is called seaflore spreading.The crust closeset to the ridge is younger than the crust farther away frm the ridge.

fault

________ are a crack in a body of rock that the rock can move along

ocean basin

_________ ________ are depressions of the seabed.

oceanic crust

_________ _________ is relitively thin crust under the ocean basins, younger and more dense than continental crust, it is mostly made of basalt.

continental crust

___________ ________ is relatively thick crust that forms the continents, older and less deserve than oceanic crust, mostly made of granite.

convection

____________ is the rising of hot air above cooler air, which produces air currents

Physical change

a change in matter that does not affect its chemical composition.

Friction

a force that opposes the motion of a body across a surface or through a gas or liquid.

Deposition

occurs when eroded sediments are dropped in another location, ending the process of erosion.

tectonic plate

one of several huge pieces of Earth's crust

Weathering

the breaking down of rock into smaller pieces by the action of wind, rain, and temperature change.

Erosion

the process in which wind, water, ice, or other things move pieces of rock and soil over Earth's surface.