Geology and Earth's Structure Quiz

Who proposed the concept of Seafloor Spreading?

• Alfred Wegener

• Harry Hess

• Charles Darwin

• Isaac Newton

What is the boundary between the Lithosphere and Asthenosphere called?

• Moho

• LAB

• Gutenberg

• Lehman

Which type of rock is the Lithosphere primarily made of?

• Dense mafic rock

• Low density felsic rock

• Dense ultramafic rock

• Intermediate rock

What is the primary composition of the oceanic crust?

• Low density felsic rock

• Dense mafic rock

• Intermediate rock

• Dense ultramafic rock

Why does the lithosphere sit on the asthenosphere?

• It is denser and thinner

• It is thicker and less dense

• It is softer and more flexible

• It is hotter and more fluid

What are active margins associated with?

• Plate boundaries

• Ocean floors

• Continental shelves

• Seismic belts

What is the surface of a sediment pile known as?

• Ridge Axis

• Continental Shelf

• Median Valley

• Passive Margin Basin

Where does the ocean floor typically form?

• At plate interiors

• At mid-ocean ridges

• At passive margins

• At seismic belts

What is the centerline of a mid-ocean ridge called?

• Median Valley

• Ridge Axis

• Seismic Belt

• Continental Shelf

What percentage of the asthenosphere melts when it rises below Earth's surface?

• 10%

• 15%

• 20%

• 25%