Plate Tectonics and the Seafloor Practice

Which statement is NOT true about Iceland?

• The Mid-Ocean Ridge runs through it
• It is getting bigger every year
• It is located in the Pacific Ocean
• It is located at a divergent plate boundary
• It has more than 10 active volcanoes

The Peru-Chile Trench runs along the coast of South America, where an oceanic plate is being subducted under a continental plate. Which of the following would you expect to find parallel to the trench?

• volcanoes
• another trench
• a mid-ocean ridge
• a hot spot

True or False: The red dots on this map are showing the locations of deep sea trenches.

• True
• False

Which of the following best describes the island of Maui?

• It will continue to get larger from lava flow for at least another 100 million years
• It will eventually erode and sink back into the ocean and not much of it will remain in another 20 million years
• It will begin to get larger in about 20 million years when it is back over the hot spot

Which of the following is NOT true of the Mariana Trench?

• it's in the Atlantic Ocean
• It is around 6 miles deep
• The deepest point is called the Challenger Deep
• Only specialized submarine can reach to the bottom
• It is a result of plate tectonics

Which is the best explanation for what is happening at Location B?

• One plate is being subducted under another
• two plates are colliding and folding upwards to create mountains
• two plates are separating to form a trench

Which of the following is NOT correct?

• Rock A and rock D are not the same age
• Rock B and rock C are the same age
• Rock B and rock C would have the same magnetic history
• Rock A is older than rock D

The deepest trench is the

• Mariana Trench
• Puerto Rico Trench
• Peru-Chile Trench
• Java Trench

Alfred Wegener proposed the Theory of

• Plate Tectonic
• Continental Drift
• Hot Spots
• Earth's Magnetic Field

What does the magnetic information stored in rocks tell us about the seafloor?

• the depth at the time the rocks formed
• the age of the rocks
• the direction of the magnetic north pole at the time the rocks formed