Plate Tectonics

This is a picture of glacier scars found in Africa.  What are these evidence for?

• Africa has always been near the equator
• Africa was once in an area of the Earth that had a very cold climate
• The continents have not moved
• sea floor spreading

What does the theory of continental drift state?

• The continents were once joined in a super-continent and have moved over time
• Continents are stationary and do not move
• The Earth is broken into lithospheric plates that move due to convection currents
• none of the above

Why did no one believe Wegener's thoery?

• He could not explain HOW the continents moved
• He didn't have evidence
• His data was wrong
• He didn't use the right technology to gather data

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

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

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

Who is the scientist who proposed Continental Drift Theory?

• Albert Einstein
• Alfred Wegener
• Isaac Newton
• John Dalton

Earthquakes and volcanoes are most likely found in which locations? 

• at plate boundaries
• in oceans
• in the middle of continents
• in the middle of plates

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

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