7E6.5 Seafloor Spreading

Scientists believed and supported Alfred Wegener's Continental Drift Theory when he first proposed it.

• True

• False

What evidence did Harry Hess use to propose Seafloor Spreading?

• He was a submarine commander so scientists went on his word.

• He discovered flat topped mountains.

• He observed continental movement with his own eyes.

Tags

NGSS.MS-ESS2-3

What did Harry Hess believe actually pushes the continents apart?

• Hot Molten Magma

• The Motion of the Ocean

• Earthquake Movement

Tags

NGSS.MS-ESS2-3

Mirrored magnetic signatures in the oceans floor show that the north and south pole reverse periodically.

• True

• False

Scientists found that the older crust is found near the mid-ocean ridge.

• True

• False

Tags

NGSS.MS-ESS2-3

The term used for the action of older crust going back into the Earth to melt is

• subtraction

• subduction

• submarine

• substitute

Tags

NGSS.MS-ESS2-2

NGSS.MS-ESS2-3

If seafloor spreading, or Continental Drift, did not happen all of the land in the world would be connected. We would only have one continent.

• True

• False

Tags

NGSS.MS-ESS2-2

NGSS.MS-ESS2-3