Seafloor Spreading

Which hypothesis states that new seafloor is being made at the mid-ocean ridge and then moves sideways away from the mid-ocean ridge?

• Continental Drift

• Seafloor Spreading

• Mid-Ocean Ridge

• Sonar

What is Magma?

• Molten rock on the surface of Earth

• Molten rock underground

• Molten metal

What is lava?

• Molten rock found above the ground

• Molten rock found underground

• Molten metal

What is the name of Earth's longest mountain range?

• Appalachian mountains

• Mid-Ocean ridge

• Rocky Mountains

• Caledonian Mountains

The following answers are all ways of investigating the seafloor, which bounces sound waves off the seafloor to measure depth?

• Alvin the submersible submarine

• Deep Sea Drilling

• sonar

• magnetometers

What type of rock records magnetic field information on the seafloor?

• metamorphic

• sedimentary

• igneous

What moves magma in the mantle towards Earth's surface?

• tides

• convection currents

• our planet's magnetic field

• internal pressure

How often is new seafloor being made at the mid-ocean ridge?

• only when Earth's polarity reverses

• once a year

• a few times each century

• continuously

Which of the following provides evidence to support the hypothesis of seafloor spreading?

• seafloor drilling

• fossil evidence

• Pangaea

• ancient climate evidence

Who proposed the hypothesis of Seafloor Spreading?

• Alfred Wegener

• Harry Hess

• Albert Einstein