geology : a scientific theory that the Earth's surface is made of very large sections that move very slowly and create geological features such as mountains, volcanoes, faults, and other natural geographic features
the very slow movement of the continents across the earth's surface over a very long period of time.
The term pangea refers to a hypothetical supercontinent that included all the landmasses of the earth
the upper layer of the earth's mantle, below the lithosphere, in which there is relatively low resistance to plastic flow and convection is thought to occur.
the rigid outer part of the earth, consisting of the crust and upper mantle.
A series of mountain ranges on the ocean floor, more than 84,000 kilometers (52,000 miles) in length
a large elongated depression with steep walls formed by the downward displacement of a block of the earth's surface between nearly parallel faults or fault systems.
the sideways and downward movement of the edge of a plate of the earth's crust into the mantle beneath another plate.