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

What is the most important point the author makes in paragraph 5?

• It is impossible for anyone to dive down into the Mariana Trench.

• It is possible for anyone to dive down into the Mariana Trench.

• A 1- gallon milk jug holds about 8 pounds of water.

A ______________ is a long, narrow groove or ditch.

• trench

• summit

• thrive

• prehistoric

The ______________of a mountain is its top or highest point.

• trench

• thrive

• summit

• prehistoric

Many types of plants ______________in a rainforest.

• summit

• thrive

• prehistoric

• trench

____________________animals, like dinosaurs, roamed the Earth long before people.

• trench

• thrive

• summit

• prehistoric