7.9.2 The Development of a Theory

Mountain ranges in the middle of the ocean:

• mid-ocean mountains

• mid-ocean wrinkles

• mid-ocean ridges

• mid-ocean valleys

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The process by which new oceanic crust forms along a mid-ocean ridge:

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Smooth layer of sediments that covers much of the ocean floor:

Evidence for seafloor spreading:

• fossils

• magnetic reversals

• age of sediments

• volcanoes

• temperature measurements

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NGSS.MS-ESS2-3

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.MS-ESS2-3

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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What two words are BEST used to describe how the seafloor spreads?

• Magma and convection
• Earthquakes and convection
• Magma and convention
• Volcanoes and earthquakes

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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

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What technology was used during WWII to detect enemy submarines and produce the first map of the seafloor?

• Sonar
• Radar
• GPS

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The OLDEST seafloor is located? 

• Closest to the mid-ocean ridge
• Farthest from the mid-ocean ridge