Mariana Trench

The passage says that if Mount Everest were placed in the Challenger Deep, its peak would be underwater. What does peak mean?

• top

• size

• shape

• weight

Which point is best supported by the information about anglerfish and flashlight fish?

• Special instruments allow humans to study the deep sea

• Humans cannot live in the rough conditions in the deep sea

• Some animals have skills that help them live in the deep sea

• Scientists are just beginning to understand animals in the deep sea

The Challenger Deep is the deepest point in the Mariana Trench. How did the Challenger Deep get its name?

• It was named after the British Royal Navy ship sent to measure the ocean depths

• Its name comes from a machine whose weights extend to the bottom of the ocean

• Its name is related to a type of echo sounder that sends sound waves to the seafloor

• It was named after the scientists who discovered that water near the Mariana Islands was very deep

What is happening at the bottom of the Mariana Trench?

• The Puerto Rico Trench is being created.

• The bottom of the Mariana Trench is moving up, toward the surface.

• A layer of puttylike rock is moving between a heavy plate and a lighter plate.

• A heavy plate of rock is pressing into a lighter plate of rock, causing the heavy plate to move down.

Why do U.S. naval submarines use the Mariana Trench as an expressway?

• The water at the bottom of the trench is clearer.

• It is more difficult for enemies to detect them there.

• The area provides a safe space away from harmful forces of nature.

• The navy has mapped the entire trench and is familiar with the entire area.