Sci 10 Q1 Evidences of Plate Movements

The idea proposed by Alfred Wegener to explain the continental shapes and

positions is known as _____.

• Pangea

• Continental Drift

• Plate Tectonics

• Seafloor Spreading

Examine the figure on the right, which two are the best examples of different continental positions in the past?

• North America – South America

• North America – Africa

• South America – Asia

• South America – Africa

In the Mid-1900s, scientists mapped mid-ocean ridges using what?

• Satellites

• Moons

• Stars

• SONARs

Early observers thought continents might have been joined based on what

observation?

• Rocks and Fossils

• Earthquakes

• Magnetism

• Coastline

Wegener suggested that coal beds discovered in Antarctica indicated that this

continent was

• once underwater

• once near the equator

• always frozen

• part of Africa

In the figure above, what is the age of the seafloor off of the Bahamas?

• younger than 9.6 million years

• 9.6 – 33.0 million years

• 33.0 – 83.0 million years

• 83.0 – 141.9 million year

In the figure above, what is the approximate age of the seafloor off the north

coast of Spain?

• younger than 9.6 million years

• 9.6 – 33.0 million years

• 33.0 – 83.0 million years

• 83.0 – 141.9 million years

Peer scientists reviewing Wegener's hypothesis of continental drift rejected his

notion because____________.

• his evidence was too few to make a valid conclusion.

• he did not explain how continents move and what moves them.

• his evidence was not clear in showing how continents were joined.

• he lied by including false evidence.

___________ help explain why Earth is not getting any larger even though the

tectonic plates are always moving.

• Earthquakes

• Fossils

• Subduction zones

• Volcanoes

If there are MORE mid-ocean ridges than subduction zones, what happens to

the ocean?

• It gets larger.

• It sinks.

• It gets smaller.

• Nothing will change.