Seafloor Spreading and Mid-Ocean Ridge Quiz

What technology did Hess use to study the ocean floor?

• Radar

• Sonar

• Satellite imaging

• Magnetic resonance

What is the primary composition of the oceanic crust?

• Limestone

• Basalt

• Sandstone

• Granite

Which layer is described as a 'soft plastic' layer beneath the oceanic crust?

• Outer core

• Lithosphere

• Asthenosphere

• Mesosphere

What did Hess discover at the mid-ocean ridge?

• A large underwater cave

• A deep ocean trench

• An underwater mountain range

• A coral reef

What type of rock is formed from lava at the mid-ocean ridge?

• Granite

• Basalt

• Andesite

• Gabbro

What geological feature is created by the upwelling of magma at the mid-ocean ridge?

• Ocean trench

• Seamount

• Underwater volcano

• Volcanic island

What evidence supports the theory of seafloor spreading?

• The presence of coral reefs

• The age of basaltic rocks

• The depth of ocean trenches

• The salinity of ocean water

How do scientists confirm the movement of continents?

• By observing volcanic eruptions

• By tracking ocean currents

• By measuring ocean salinity

• Using satellite data

What is the average rate of movement for the ocean floor?

• 5-6 cm per year

• 3-4 cm per year

• 1-2 cm per year

• 7-8 cm per year

Which continents are moving apart due to seafloor spreading?

• South America and Africa

• Asia and Africa

• Europe and North America

• Australia and Antarctica