Seafloor Spreading

Select all that apply:

Which technological advances in the 1940s and 1950s changed how scientists viewed the ocean floor?

• sonar

• magnetometer

• spectrograph

• underwater telescope

Tags

NGSS.HS-PS4-5

A device that can detect small changes in magnetic fields is called a(n)

• sonar

• magnetometer

• spectrograph

• underwater telescope

Tags

NGSS.MS-PS2-5

What sediment evidence led to the discovery of seafloor spreading?

• Layers of sediments on the ocean floor are much thinner than layers of sediment on continents.

• Layers of sediments on the ocean floor are much heavier than layers of sediment on continents.

• Layers of sediments on the ocean floor are much thicker than layers of sediment on continents.

Tags

NGSS.MS-ESS2-3

What happens when the flow in the outer core changes, and Earth's magnetic field changes direction?

• magnetic symmetry

• paleomagnetism

• core reversal

• magnetic reversal

A magnetic field that has the same orientation as Earth's present field has _______________ polarity.

• good

• normal

• abnormal

• retrograde

A magnetic field that is opposite to the present field has ______________ polarity.

• normal

• reversed

• retrograde

• backward

Tags

NGSS.MS-PS2-5

NGSS.MS-PS2-3

What device can detect small changes in magnetic fields?

• magnetometer

• spectrograph

• seismometer

The study of the history of Earth's magnetic field is called...

• Geology

• Biology

• Paleomagnetism

• Astronomy

Select all that apply:

Which major ocean-floor features were discovered by data collected by sonar and magnetometers?

• deep-sea trenches

• continental shelves

• ocean ridges

Tags

NGSS.MS-ESS2-3

What did scientists learn by matching magnetic patterns on the seafloor with known patterns of magnetic reversals on land?

• the temperature of the ocean floor

• the depth of the ocean floor

• the age of the ocean floor

Tags

NGSS.MS-ESS1-4