Unit 7 plate tectonics

tectonic plate

a block of lithosphere that consists of the crust and upper mantle

fault

Break in a body of rock along which one bloc slides relative to another

mantle

the layer of rock between the Earths crust and core

fossil

The trace or remains of an organism that lived long ago, most commonly preserved in sedimentary rock

volcano

Vent or fissure in earths surface through which magma and gases are expelled

crust

the thin and solid most outer layer of Earth above the mantle

Hot spot

Volcanically active area on the surface commonly far from plate boundaries

Lithosphere

the solid outer layer of earth that consists of the crust and the rigid upper part of the mantle

superposition

a principle that states that younger rocks lie above older rocks if the layers have not been disturbed

sedimentary rock

forms from compressed or cemented layers of sediments

earthquake

a movement or trembling of the ground that is cause by a sudden release of energy when rocks move along a fault

mountain

Area of significantly increase elevation

ocean basin

the area of earth that is covered by ocean

transform boundary

plates that slide past each other

convergent boundary

plates moving towards each other

divergent boundary

plates that move away from each other

convection current

plates move and spread because of

Divergent boundary

seafloor spreading

convergent boundary

volcanos, mountains, subduction

Transform boundary

fault lines and earthquakes

radioactivity

what do they measure to find the age of rocks

Harry Hess

Sea floor spreading theory

Alfred Wegener

Continental Drift Theory

Dan mckenzie

Plate tectonics theory