Scientist who came up with the theory of Continental Drift.
The theory that states that all Earth's continents were once a single landmass called Pangaea.
The one single landmass scientists believe existed before the continents broke apart.
The scientist that came up with the theory of seafloor spreading.
The theory that new ocean crust is formed at ocean ridges and destroyed at deep-sea trenches.
Thoery of Plate Tectonics
The theory that says Earth's crust and rigid upper mantle are broken into enormous slabs called plates.
Areas where tectonic plates interact.
Places where tectonic plates are moving towards one another.
Places where tectonic plates are moving apart from one another.
Places where 2 plates slide past each other horizontally.
When plates meet and 1 of the 2 plates is is forced benath the other.
Divergent boundaries that occur on land
The internal resistance to flow (how "sticky" a substance is).
Forms from crust being sub-ducted, pushed down, into the Earth's mantle. This magma type has an intermediate viscosity.
Forms from rock in the upper mantle melting. This magma type has a low viscosity.
Forms from molten material rising and mixing with the crust above it. This magma type has a high viscosity
These produce mountains with a broad, gently sloping side and a nearly circular base.
These volcanoes have steep sides and are generally small.
These are much larger then Cinder-Cone Volcanoes.
Rock fragments thrown into the air during an eruption.
Rapidly moving tephra and volcanic ash that moves down the volcano.
Volcanoes found far away from plate boundaries.