sicenecs

Harry Hess

________- made a discovery that would vindicate wegener.

Convection Current

________ is the driving force of plate tectonics.

Magma

________ gets pushed up at the mid ocean ridges and creates new lands while the subduction zones gobble up the land on the other side of the plates.

Seafloor Spreading

________ provided insight to the mechanism for how the continents moved.

Volcanism

________ is mostly found at plate boundaries /margins.

deep depression

Trench- a long, narrow, ________ in the ocean bed, typically one running parallel to a plate boundary and marking a subduction zone.

Convection Currents it

________ is the fluid or magma flow in the mantle.

tectonic plate

The ________ moves over a hotspot forming a chain of volcanoes (refer to figure 4)

Oxygen

________ is the most common element in the crust.

radioactive decay of uranium

Heat in the core is probably generated by the ________ and other elements.

Mid Ocean Ridge

________- a central valley on an ocean floor at the boundary between two diverging tectonic plates where new crust forms from upwelling magma.

Panthalassa Ocean

________- is the name of the ocean surrounding the whole pangea.

plate motion

The ________ makes them collide, pull apart, and scrape against each other.

oceanic plates

When two ________ collide, one runs over the other which causes it to sink creating a subduction zone.

3 main layers

crust, mantle, core (lithosphere, convecting mantle, dense metallic core)

5 mechanical layers

 lithosphere, asthenosphere, mantle,outer core, inner core

He proposed that Pangea was split apart and the continents had moved gradually to their present positions

a process that became known as continental drift