Plate Movement

define thermal convection

what do you call the upper part of the Earth’s mantle?

cooler,denser material descends carried by _______________

how is an ocean ridge formed?

TRUE/FALSE: Warm, less dense material of the lower mantle rises very slowly in the regions of oceanic ridges

The _________________ have revealed that the flow of material in the mantle is very complex

plate movement occurs because of two processes called ____________ AND _________

the subducting cold and denser slab of lithosphere pulls the rest of the plate as it moves down-ward into the asthenosphere

a German meteorologist, proposed the continental drift hypothesis

the theory where all landmasses were originally united in a single supercontinent

a Greek word meaning “all land.

What evidence did Wegener have that the continents were joined together in a gigantic landmass?

The fossil remains of animals like the ___________

The fossil remains of the _____________ flora found in South America, Africa, India, Antarctica, and Australia

where was the Glossopteris found?

a scientist who used sonar to map the ocean floor as a US Navy officer during World War II tied his knowledge of the then newly discovered Mid-Atlantic Ridge to the continental drift theory

He proposed the theory of seafloor spreading to explain the moving continents.

the newly formed crust moved laterally away from the ridge, known as the _____________

the residual magnetism in ancient rocks, which records the direction and intensity of Earth’s magnetic poles at the time the rock was formed

define paleo

define paleontology

define paleoclimate

It is the result of the changing speed of rotation of the mantle and the outer core.

the complete reversal of the north and south magnetic poles