Module 17 Flashcards
Core
Innermost zone of Earth
Mantle
Part of Earths core that slowly circulated in convection cells
Magma
Molten rock
Asthenosphere
Located in the upper part of the mantle
Lithosphere
The lighter portion of Earths lithosphere
Crust
Brittle outermost layer of earth
Theory of plate tectonics
A theory which states Earths lithosphere is divided I to plates, most of which are in constant motion
Tectonic cycle
The sum of process that build up and break down lithosphere
Divergent plate
When plates move away from each other
Sea floor spreading
Prompts the formation of mid-ocean ridges
Convergent plate boundary
Where plates move toward one another and collide
Transform fault boundary
When plates move sideways past each other
Fault
Fracture in rock
Earthquake
occurs when rocks along the fault become stressed
Seismic activity
Frequency and intensity of earthquakes experienced over time
Rock cycle
Constant formation and destruction of rocks
Rock
Composed of one or more minerals
Minerals
Solid chemical substances with uniform structures that form under specific temperatures and pressures
Igneous rocks
Form directly from magma
Intrusive igneous rock
A type of igneous rock formed with Earth
Extrusive igneous rock
A type of igneous rock formed above Earths surface
Sedimentary rocks
Form when sediments become compressed by overlying sediments and then cemented together by water
Metamorphic rocks
Form from rocks subjected to high temperature and pressure
