Alfred Wegener and Seafloor Spreading Quiz

What did Alfred Wegener theorize?

• Continents were all together at one time and they have slowly moved apart.

• Continents have always been in their current positions.

• Continents are moving towards each other.

• Continents are shrinking over time.

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Who discovered Seafloor Spreading?

• Harry Hess

• Alfred Wegener

• Isaac Newton

• Charles Darwin

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What happens during seafloor spreading?

• Magma rises from the mantle to Earth’s surface in between the tectonic plates.

• Water flows into the mantle.

• Continents collide and form mountains.

• Earthquakes occur frequently.

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What evidence do we have that seafloor spreading is true?

• Rock age - the younger rock is closest to the boundary. Older rock is further away.

• Fossils are found in the ocean.

• Water levels rise and fall.

• Tides change daily.

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What are pieces of Earth's crust called?

• Tectonic plates

• Magma layers

• Ocean floors

• Mountain ranges

Explain how convection currents work.

• Magma close to the core is less dense due to the heat. It rises towards the surface.

• Magma stays still and does not move.

• Magma cools and sinks without rising.

• Magma only moves horizontally.

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Identify the 3 types of boundaries and the directions they move in.

• Convergent, divergent, transform

• Convergent, parallel, perpendicular

• Divergent, parallel, transform

• Transform, circular, convergent

How do convergent boundaries move?

• Move away

• Slide against

• Move towards

• Stay still

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How do divergent boundaries move?

• Move towards

• Slide against

• Move away

• Stay still

Why does the oceanic plate submerge in subduction zones?

• It is less dense than the continental plate

• It is more dense than the continental plate

• It is the same density as the continental plate

• It is lighter than the continental plate