Seafloor Spreading

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

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. 

True or False: The continents on the eastern (the Americas) and western (Europe, Africa) side of the Atlantic Ocean are moving closer together. 

• True
• False

What is FALSE about the age pattern on the seafloor in the Atlantic Ocean? 

• The pattern is symmetrical on each side of the Mid-Atlantic ridge (plate tectonic boundary)
• The oldest seafloor can be found towards the edges of the ocean, near the eastern and western continents
• The youngest sea floor can be found towards the edges of the ocean, near the eastern and western continents
• Seafloor near the Mid-Atlantic ridge (plate tectonic boundary) can be up to 10 million years old

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

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

True or False: Our continents will eventually become a supercontinent (like Pangaea) again, far in the future

• True
• False

Massive pieces of land that are part of the Earth's crust and upper mantle

• Tectonic plates
• Trenches
• Divergent boundary
• Continental shelves

The zone where one plate slides under another is called the

• Convergent zone
• Subduction zone
• Transform zone
• Mantle zone

What causes the crust to move?

• convection
• conduction
• tension
• radiation

When looking at mid ocean ridges the oldest rocks are 

• In the middle
• Found close to the rift zone
• Found far from the mid ocean ridges