Restless Continents 1.8

New oceanic lithosphere is unable to form at mid-ocean ridges. 

• True
• False

Bands of magnetic material in the sea floor that have opposite poles, or exhibit magnetic reversal, can provide evidence for sea floor spreading.

• True
• False

What is the hypothesis that states that the continents were once one large mass that broke apart?

• Continental Drift
• Pangaea
• Wegener's Theory
• Sea-Floor Spreading

The idea that the continents were once one large landmass called Pangaea is part of the theory of continental drift.

• True
• False

Sea floor __________ involves plates under the ocean moving farther apart and colliding with continental plates that are then pushed away or toward each other.

• drifting
• spreading
• shifting
• movement

A process that takes place at mid-ocean ridges is ____.

• continental drift
• oceanic convection
• sea-floor spreading
• volcanoes

Magnetic minerals are found at mid-ocean ridges.

• True
• False

This substance hardens to form new rock at mid-ocean ridges.

• lava
• magma
• minerals
• basalt

Which of the following are used as evidence for continental drift?

• early human tools
• pottery shards
• volcanic glass
• fossils

Which of the following is used as evidence for sea-floor spreading?

• opposite polarization
• magnetic reversal
• fossilization
• mountain ridges