ES30: 1 - Earth Formation and Plate VOCAB

Front

Supercontinent at the end of the Paleozoic Era

Back

Pangaea

Front

Widening of an ocean basin as new oceanic crust forms at a mid-ocean ridge and moves away.

Back

Sea-Floor Spreading

Front

A cloud of gas or dust in space

Back

Nebulae

Front

Seismic-velocity discontinuity between Earth's crust and mantle

Back

The Moho

Front

Point on Earth's surface above earthquake focus

Back

Epicenter

Front

Layer of the mantle that is soft and can flow under force

Back

Asthenosphere

Front

Max. amplitude of ground motion from epicenter

Back

Magnitude

Front

Process in a planet's early history where dense iron alloy melted and sank to form the core, leaving a less-dense mantle.

Back

Differentiation

Front

Planets form from gas, dust, and ice around a newborn star.

Back

Nebular Theory

Front

Ancient magnetism record in rock

Back

Paleomagnestism