The soft layer of the mantle, where the lithosphere floats.
asthenosphere
Records the seismic waves of an earthquake, produced by a seismograph.
seismogram
The process of oceanic crust sinking beneath a deep-ocean trench.
subduction
A layer of hot, solid material between the crust and the core.
mantle
Occurs naturally, an inorganic solid with a crystal structure.
mineral
Made of molten iron and nickel, surrounds Earth's inner core.
outer core
Two plates move past each other in opposite directions.
transform boundary
A section of the lithosphere, carries continental and oceanic crust.
plates
A break in Earth's crust, where rocks slip past each other.
fault
Name of the landmass of all combined continents long ago.
Pangea
The uppermost part of the mantle and crust.
lithosphere
A process where water and wind loosen and carrry rock fragments.
erosion
Found in continental crust, a light-colored igneous rock.
granite
A dark, dense rock found in oceanic crust.
basalt
A layer of rock that forms the surface of Earth.
crust
A hypothesis that the continents move slowly across Earth's surface.
continental drift
Forms from an existing rock changed by heat, pressure, or chemical reactions.
metamorphic rock
When sediment settles out of the wind or water carrying it.
deposition
Stress that squeezes a rock until it folds or breaks.
compression
Forms where two plates move apart.
rift valley