Sea-Floor Spreading

___________ form long chains of mountains that rise up from the ocean floor.

• Sea-Floor Spreading

• Subduction

• Mid-Ocean Ridges

• Deep-Ocean Trench

What tool was used to map mid-ocean ridges?

• Gravity

• X-rays

• Radiation

• Sonar

Tags

NGSS.MS-ESS2-3

True or False: Scientists found that mid-ocean ridges extend into only 2 oceans.

• True

• False

True or False: Mid-ocean ridges are longer than the Rockies in North America and the Andes in South America.

• True

• False

Which of the following did scientists discover by the 1960s about mid-ocean ridges?

• Mid-ocean ridges continually decrease in size each year

• Mid-ocean ridges continually add new material to the ocean floor

• Mid-ocean ridges continually destroy the earth's mantle

• Mid-ocean ridges continually pollute ocean water

Tags

NGSS.MS-ESS2-1

Where does sea-floor spreading begin?

• Subduction

• Mid-Ocean Ridges

• Deep-Ocean Trenches

• Outer Core

True or False: Sea-floor spreading occurs in oceanic crust.

• True

• False

Tags

NGSS.MS-ESS2-3

__________ adds more crust to the ocean floor.

• Sea-floor spreading

• Subduction

• Mid-Ocean Ridges

• Deep-ocean trenches

Which of the following is a deep underwater canyon?

• Subduction

• Inner Core

• Deep-ocean trenches

• Mid-ocean ridges

Part of the ocean floor sinks back into the ________ at deep-ocean trenches.

• Crust

• Mantle

• Outer Core

• Inner Core

Tags

NGSS.MS-ESS2-3