HMH Grade 4 Comprehension Flashcard - "Mariana Trench"

Front

What is the Mariana Trench?

Back

The Mariana Trench is the deepest part of the world's oceans, located in the western Pacific Ocean.

Front

What is the Challenger Deep?

Back

The Challenger Deep is the deepest point in the Mariana Trench.

Front

Why do some animals have special skills to live in the deep sea?

Back

Animals like anglerfish and flashlight fish have adaptations that help them survive in extreme conditions, such as darkness and high pressure.

Front

What does the term 'peak' mean in the context of mountains?

Back

The term 'peak' refers to the top or highest point of a mountain.

Front

How do U.S. naval submarines use the Mariana Trench?

Back

They use it as an expressway because it is more difficult for enemies to detect them there.

Front

What geological process occurs at the bottom of the Mariana Trench?

Back

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

Front

How did the Challenger Deep get its name?

Back

It was named after the British Royal Navy ship, HMS Challenger, which was sent to measure ocean depths.

Front

What is the significance of the Mariana Trench in oceanography?

Back

It helps scientists understand deep-sea ecosystems and geological processes.

Front

What adaptations do flashlight fish have?

Back

Flashlight fish have light-producing organs that help them communicate and attract prey in the dark ocean.

Front

What is one reason humans cannot live in the deep sea?

Back

The deep sea has extreme pressure, darkness, and cold temperatures that are not suitable for human life.