It's Erupting
A molten mixture of rock forming substances, gases and water from the mantle.
Magma
Earthquakes can occur at this type of boundary where plates slip past each other.
Transform
A break in earth's crust along which rocks move.
Fault
A force that acts on rock causing it to change its shape of volume.
Stress
A wave or series of waves caused by an earthquake.
Tsunami
Type of volcano where lava flows out of several long cracks in Earth's crust and floods an area repeatedly over many years, resulting in flat layers of hardened lava.
Lava Plateau
Boundary where the plates move apart, or diverge, from each other.
Divergent
Very dense crust that is underwater.
Oceanic Crust
The shaking that results from the movement of rock beneath the earth's surface.
Earthquake
A fold in rock that bends upwards into an arch, can create a mountain.
Anticline
Also called a hot spot volcano, this type has slow steady eruptions in which lava flows out and builds up over a broad area.
Shield Volcano
Theory that the earth's lithosphere is broken up into distinct plates.
Theory of Plate Tectonics
Thicker, less dense crust that is above water.
Continental
An undersea mountain chain where new ocean floor is produced, a divergent plate boundary under the ocean.
Mid-ocean ridge
A device used to measure the seismic waves produced by an earthquake.
Seismograph
If lava emerges from a new vent in earth's crust as a mix of bombs, ash, and cinders.
Cinder Core Volcano
Driving force responsible for the movement of plate tectonics.
Convection currents
This type of stress pulls on the earth's crust.
Tension
The measurement of an earthquake's strength.
Magnitude
Land features, fossils, and climate are all evidence of
Pangea (Wegener's Theory)
Magma with less of this flows more easily, magma with more of it is stickier and thicker resulting in more explosive eruptions.
Silica
A dense plate of oceanic crust goes under an adjacent section of earth's crust.
Subduction
This type of stress squeezes rock till it folds or breaks.
Compression
An area where magma from deep within the mantle melts through the crust above it.
Hot Spot
Theory that all of the continents had once been fused together and that over time they had drifted apart.
Wegener's Theory