Lesson Check: Development of a Theory

As new seafloor moves away from an ocean ridge, the seafloor cools and becomes less dense than the material beneath it.

• True

• False

The youngest rocks on the ocean floor are located...

• near continents

• at mid-ocean ridges

• far from mid-ocean ridges

• near Asia

Which of the following best explains the age of oceanic crust and ocean-floor features?

• seafloor spreading

• continental drift

• subduction

• crystallization

Tags

NGSS.MS-ESS2-1

NGSS.MS-ESS2-3

New ocean crust is continually formed at...

• mid-ocean ridges

• trenches

• subduction zones

• ocean basins

Tags

NGSS.HS-ESS1-5

NGSS.HS-ESS2-1

The theory of _____ explains how new crust is created at mid-ocean ridges.

• seafloor spreading

• continental drift

• plate tectonics

• conservation of mass

What new technology was used to map the seafloor beginning in the 1940s ad 1950s?

• sonar

• periscopes

• scanners

• telescopes