<- Continental Drift
Continental drift: The hypothesis that states that the continents once formed a single landmass, broke up, and drifted to their present location.
<- Pangaea
PANGAEA: The supercontinent that formed 300 million years ago and that began to brake up 250 million years ago.
<- ASTHENOSPHERE
ASTHENOSPHERE: The solid, plastic layer of the mantle beneath the lithosphere; made of mantel rock that flows very slowly, which allows tectonics plates to move on top of it.
<- Lithosphere
Lithosphere: The solid, outer layer of Earth that consists of the crust and the rigid upper part of the mantel.
<-Mid-Oceanic Ridge
Mid-Oceanic Ridge: A long, undersea mountain chain that has a steep, narrow valley at its center, that forms a magma rises from the asthenosphere, and that creates new oceanic lithosphere (sea floor) as tectonic plates move apart.
<- Rift Valley
Rift Valley: A linear-shaped lowland between several highlands or mountain ranges.
<- Subduction
Subduction: Sideways or downward movement of a plate of Earths crust into the mental beneath another plate.