Continental drift and sea-floor spreading

Question 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)

Answer 1

Alfred Wegener

Question 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.

Answer 2

Seafloor spreading

Question 3

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

Answer 3

Molten material

Question 4

Rock that lies in a pattern

Answer 4

Magnetic stripes

Question 5

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

Answer 5

Older

Question 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

Answer 6

Subduction

Question 7

Underwater canyons

Answer 7

Deep-ocean trenches

Question 8

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

Answer 8

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

Question 9

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

Answer 9

Harry Hess

Question 10

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

Answer 10

Alfred Wegener and harry Hess