The Dynamic Earth

Many early mapmakers thought Earth’s continents had moved based on...

• Fossil evidence

• Matching coastlines

• Climatic data

• Plate boundary locations

Tags

NGSS.MS-ESS2-3

Continental drift was not widely accepted when it was first proposed because ____________.

• the continents were too big to move across Earth's crust.

• Wegner couldn't explain why or how the continents had moved.

• there wasn't enough convection in Earth's mantle.

• data gathered by new instruments proved the theory incorrect.

Tags

NGSS.HS-ESS1-5

Compared to ocean crust near deep-sea trenches, crust near ocean ridges is ____________.

• magnetically reversed.

• older.

• younger.

• the same age.

The magnetic pattern of ocean-floor rocks on one side of an ocean ridge is ____________.

• different than rocks on land.

• at a right angle to the ocean ridge.

• a mirror image of the other side.

• younger than the other side.

The magnetic pattern on the seafloor is

• a. a mirror image of that of the other side.

• b. at right angles to the ocean ridge.

• c. much different from the magnetic pattern found in rocks on land.

• d. younger than on the other side.

Tags

NGSS.HS-ESS1-5

NGSS.HS-ESS2-1

Ischron maps of the seafloor indicate that ocean crust is

• a. Oldest near ocean ridges

• b. Thinnest in subduction zones

• c. Youngest near ocean ridges

• d. Youngest at deep-sea trenches

Tags

NGSS.MS-ESS2-3

Each cycle of spreading and intrusion of magma during seafloor spreading results in

• plates colliding

• new ocean crust

• subduction

• magnetic reversal

Tags

NGSS.MS-ESS2-3

Features found at divergent boundaries include

• d. Ocean ridges
• Crumpled mountains

• Deep sea trenches

• Island arc volcanoes

Subduction results in the formation of

• magnetic reversal

• a rift valley

• deep sea trench

• new continental crust

Tags

NGSS.MS-ESS2-2

Continental-continental plate collisions produce

• rift valleys

• island arc volcanoes

• very tall mountain ranges

• deep sea trenches

Tags

NGSS.MS-ESS2-3