Seafloor Spreading

Front

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

Back

Towards the middle of the ocean

Front

How do scientists figure out the age of the seafloor? Options: 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.

Back

They take drill ships to many locations in the oceans and collect, then date, rock samples.

Front

True or False: The Mid-Atlantic ridge in the Atlantic ocean is the ONLY example of a divergent boundary.

Back

False

Front

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

Back

False

Front

True or False: The Pacific Ocean is shrinking

Back

True

Front

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

Back

The youngest sea floor can be found towards the edges of the ocean, near the eastern and western continents

Front

What two words are BEST used to describe how the seafloor spreads? Options: Magma and convection, Earthquakes and convection, Magma and convention, Volcanoes and earthquakes

Back

Magma and convection

Front

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

Back

True

Front

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

Back

Between 5-10 cm per year

Front

True or False: The plates will never stop moving

Back

True