Continental drift and sea-floor spreading Flashcards Preview

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Flashcards in Continental drift and sea-floor spreading Deck (10):
1

He hypothesized that at one time all the continents were once joined together in a single landmass, he named Pangea and they slowly drifted apart (1910)

Alfred Wegener

2

Seafloor spreads apart along both sides of a midocean ridge as new crust is added. Ocean floors move like a conveyor belt, carrying continents along with them.

Seafloor spreading

3

Material which looked like pillow-shaped rock formed if molten material erupts and hardens quickly

Molten material

4

Rock that lies in a pattern

Magnetic stripes

5

Evidence from drilling samples reveal that the farther from a ridge the rocks were taken the _____ they were.

Older

6

When the ocean sinks into deep underwater canyons, allowing part of the ocean floor to sink back into the mantle, over tens of millions of years

Subduction

7

Underwater canyons

Deep-ocean trenches

8

What was Alfred Wegener's evidence to support his hypothesis?

Land features (mountain ranges)
Fossils
climate change (glaciers)

9

He gave evidence about sea floor spreading and why the continents were moving

Harry Hess

10

What two scientists help discover evidence to explain how the planet looks today

Alfred Wegener and harry Hess