Sea-floor Spreading Hypothesis

In the Atlantic ocean, where is the youngest seafloor located?

• Towards the edges, near the eastern and western continents
• Towards the middle of the ocean
• Towards the north and south poles
• Young seafloor is located randomly throughout the ocean

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NGSS.HS-ESS1-5

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How do scientists figure out the age of the seafloor?

• They research it from ancient sea maps that trading vessels would use in the 1700s
• They use the moon phases and eclipses to calculate the age
• They use seismographs and the depth as well as location of earthquakes to calculate the age
• They take drill ships to many locations in the oceans and collect, then date, rock samples. 

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NGSS.HS-ESS1-5

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What is the rate at which the Atlantic Ocean is expanding? 

• Between 5-10 mm per year
• Between 5-10 cm per year
• Between 5-10 km per year
• Between 5-10 inches per year

Tags

NGSS.HS-ESS2-2

The youngest rocks on the ocean floor are located ____.

• near continents

• at mid-ocean ridges

• far from mid-ocean ridges

• near Asia

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NGSS.HS-ESS1-5

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The crust and upper mantle make up Earth's ____.

• asthenosphere

• lithosphere

• core

• continents

Scientists have observed that the continents move apart or come together at speeds of a few centimeters per ____.

• century

• year

• day

• decade

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NGSS.HS-ESS1-5

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Seafloor spreading occurs because ____.

• new material is being added to the asthenosphere

• earthquakes break apart the ocean floor

• sediments accumulate at the area of spreading

• molten material beneath Earth's crust rises to the surface

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NGSS.HS-ESS1-5

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A vast, underwater mountain chain is called a(n) _________.

• ocean ridge

• oceanic crust

• deep-sea trench

• ocean floor sediment

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NGSS.HS-ESS2-1

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

• satellites

• submarines

• deep-sea diving

• sonar

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NGSS.MS-ESS2-3

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

• in deep-ocean trenches

• along the edges of all the continents

• along mid-ocean ridges

• at the north and south plate

Tags

NGSS.HS-ESS1-5

NGSS.HS-ESS2-1