8.9B

fault

A break - The crustal feature formed when two continental plates slide against each other

Subduction zone

A destructive plate margin where oceanic crust is being pushed down into the mantle beneath a second plate.

Mountain range

A group of connected mountians

ridge

A long, narrow chain of hills or mountains - underwater for divergent boundaries

Subduction zone

Boundary in which two plates come together and one plate plunges under another turning into magma

Geologic

Having to do with the science devoted to the study of the Earth, particularly the solid Earth and the rocks that compose it.

Volcanic island

Island like Hawaii where a volcano was formed to make the entire island. Results from melting related to the subduction of the older, denser oceanic crust.

mountains

Mountains form when tectonic movements squeeze rock layers together into accordion-like, folded mountains.

Crustal features

The features on Earth's crust that are created as a result of plate tectonics.

Collide

crash together with violent impact

rift valley

crustal feature formed when two continental plates move away from each other

Earthquake

a sudden and violent shaking of the ground, as a result of movements within the earth's crust or volcanic action.

hot spot

a volcanically active area of Earth's surface far from a tectonic plate boundary

Volcanoes

an opening in the Earth's crust through which molten lava, ash, and gases are ejected. - often at convergent - subduction sites

Mid-ocean ridge

an undersea mountain chain where new ocean floor is produced; a divergent plate boundary

Divergent boundary

boundary between two tectonic plates that are moving AWAY from each other

Convergent boundary

boundary between two tectonic plates that are moving TOWARDS each other

Tectonic plates

huge pieces of crust and rigid upper mantle that fit together at their edges to cover Earth's surface

Plate boundary

the region where two tectonic plates touch

Continental crust

thicker, less dense, older crust making the continents

Oceanic crust

thinner, more dense, younger crust making up ocean floor