continental drift- the hypothesis that states that the continents once formed a single landmass,broke up, and drifted to their present locations
pangaea- the super continent that formed 300 million years ago and that began to break up 250 million
years ago.
asthenosphere- the solid, plastic layer of the mantle beneath the lithosphere; made of mantle rock that flows very slowly, which
allows tectonics plates to move on top of it.
lithosphere- the solid, outer layer of earth that consist of the crust and the rigid upper part of the mantle.
mid-ocean ridge- a long undersea mountain chain that has a steep, narrow valley at its center, that forms as magma rises
from the asthenosphere, and that creates new oceanic lithosphere (sea floor) as tectonic plates move apart.
rift valleys- the process by which earths crust breaks apart; can occur within continential crust or oceanic crust.
subduction-the amount of force per unit area that acts on a rock.
continental drift- the hypothesis that states that the continents once formed a single landmass,broke up, and drifted to their present locations
pangaea- the super continent that formed 300 million years ago and that began to break up 250 million
years ago.
years ago.
asthenosphere- the solid, plastic layer of the mantle beneath the lithosphere; made of mantle rock that flows very slowly, which allows tectonics plates to move on top of it.
lithosphere- the solid, outer layer of earth that consist of the crust and the rigid upper part of the mantle.
mid-ocean ridge- a long undersea mountain chain that has a steep, narrow valley at its center, that forms as magma rises from the asthenosphere, and that creates new oceanic lithosphere (sea floor) as tectonic plates move apart.
rift valleys- the process by which earths crust breaks apart; can occur within continential crust or oceanic crust.
subduction-the amount of force per unit area that acts on a rock.