8.ESS2.4 Vocab

Front

Theory of constant motion of continents on Earth's surface.

Back

continental drift

Front

All continents were once part of a supercontinent known as?

Back

Pangea

Front

Mountain ranges in oceans are called?

Back

mid-ocean ridges

Front

New oceanic crust forms at mid-ocean ridges while older crust moves away. This process is called?

Back

sea-floor spreading

Front

A state where magnetized objects, like compass needles, point north is called?

Back

normal polarity

Front

Occurs when the magnetic field reverses direction.

Back

magnetic reversal

Front

A state where magnetized objects reverse direction and point south is called?

Back

reversed polarity

Front

Earth's surface consists of rigid rock slabs that move relative to one another.

Back

plate tectonics

Front

The cold, rigid outermost rock layer is called?

Back

lithosphere

Front

Forms where two plates separate

Back

divergent plate boundary