FAC#7 Seafloor Spreading

_______ are mountain chains on the ocean floor.

• Sea-floor ridges

• Mid-ocean ridges

• Tectonic plates

• Photosynthesis

Tags

NGSS.MS-ESS2-3

___________ is the process by which

new oceanic lithosphere (sea floor) forms as magma rises to Earth’s surface and solidifies at a mid-ocean ridge.

• Continental drift

• Sea-floor spreading

• Plate tectonics

• Mid-ocean range

Tags

NGSS.MS-ESS2-3

In the 1960s, scientists studying the ocean floor discovered _____________.

• that the ocean floor had magnetic patterns

• the Titanic

• that the ocean floor had magical properties

• that the ocean floor was as smooth as a desert

Tags

NGSS.MS-ESS2-2

NGSS.MS-ESS2-3

Magnetic reversal is the process by which ________________.

• the Earth's north and south magnetic poles periodically change places

• the continents once formed a single landmass, broke up, and drifted to their present locations

• new oceanic lithosphere (sea floor) forms as magma rises to Earth’s surface and solidifies at a mid-ocean ridge

Tags

NGSS.HS-ESS1-5

Oceanic crust near the mid-ocean ridge is younger than oceanic crust farther away from the ridge.

• true

• false

Tags

NGSS.MS-ESS2-1

What technology did scientists use in the mid-1900s to map the mid-ocean ridge?

• satellites

• deep-sea diving

• submarines

• sonar

Tags

NGSS.MS-PS4-2

In sea-floor spreading, molten material rises from the mantle and erupts

• along the edges of all the continents

• along mid-ocean ridges

• in deep-ocean trenches

• at the north and south poles

Tags

NGSS.MS-ESS2-1

NGSS.MS-ESS2-2

NGSS.MS-ESS2-3

Select TWO ANSWERS:

Old oceanic crust is ________and ____________than new oceanic crust.

• more dense

• less dense

• colder

• hotter

Tags

NGSS.MS-PS3-4

Most geologists think that the movement of Earth's plates is caused by __________________.

• conduction

• earthquakes

• convection currents in the mantle

• Earth's magnetic field

Tags

NGSS.MS-ESS2-3

Mid-ocean ridges are ____________________.

• found in all of Earth's oceans

• found only in the Pacific Ocean

• located mostly along coastlines

• long deep-ocean trenches

Tags

NGSS.MS-ESS2-3