plate tectonics

the following is evidence that supports continental drift

continental drift is the theory that __________

The great Rift Valley in Africa is a _______.

_________are formed when two continental plates collide.

____________ causes hot, plastic like rock in the asthenosphere to rise toward the surface.

The fossil plant that helped support the theory of continental drift is_________.

plates move at a rate of ______-________ cm per year

The Glomar Challenger gathered information about rocks on the ______.

The crust and the upper ________ move around as evidence of _______________  ______________

the ________ detects ______ reversals in the oceans crust which parallels the mid-ocean ridge

The _________ is an example of a transform boundary.

Plates slide past one another at

the following is evidence that supports continental drift

the ____ is a rigid layer and is less dense than the material below it, therefore it _____

the following is evidence that supports continental drift

millions of years ago, all the continents were one land mass called __________

it is believed that convection currents are the force behind ________

Earth's thick, plastic like layer is the ______

One plate is forced under another at a

age of rocks and the growth of the atlantic ocean supports ________

which layer do convection currents occur?

as the sea floor spreads apart along a _________ new seafloor is __________

the sea floor was mapped in 1940s and 1950s by __________

the lithosphere is part of the upper mantle and ______