Seafloor mapping and Continental Drift

A lack of evidence for continental drift prevented many scientists from believing a single supercontinent called _________ existed.

• Glossopteris
• Pangaea
• Gondwanaland
• Mesosaurus

The youngest material of the ocean floor is found at mid-ocean _________.

• ridges
• trenches
• basins
• rifts

The presence of the same ________ on several continents supports the idea of continental drift.

• rocks
• fossils
• both fossils and rocks
• neither fossils nor rocks

Where would the oldest rock be found?

• L
• M
• N
• O

Which of the following is the best evidence that Earth's continents were once in vastly different positions than they are today?

• Penguins only found in southern hemisphere
• Fossils of tropical plants found in Antartica
• Volcanoes encircling Pacific Ocean
• Major rivers from deltas from continental erosion

What causes the movement of tectonic plates?

• Gravitational pull between Earth and the moon
• Convection occurring beneath the Earth's crust
• Energy produced by earthquakes within the Earth
• Rotation of liquid rock found within the core

Of the following statements, which best supports the continental drift theory?

• All oceans are salty
• Igneous rocks are found on all continents 
• Fossils of the same species of extinct land plants have been found in both South America and Africa
• Early humans migrated to North America over a land bridge from eastern Asia

The best evidence that the continents were once connected is that they have matching

• Weather, fossils, and Rock Types
• Rock types, fossils, coastlines
• Coastlines, weather, rock types
• Coastlines, weather, fossils

How did scientists discover that rocks farther away from mid-ocean ridges were older than those near it?

• by observing eruptions of molten material on the seafloor
• by mapping rocks on the sea floor using sonar
• by determining the age or rock samples obtained by drilling on the seafloor
• by measuring how fast seafloor spreading occurs

In Seafloor Spreading, molten material rises from the mantle and erupts or flows out 

• along the edges of all the continents
• along mid-ocean ridges
• in the deep ocean trenches
• in the north and south poles