Exploring the Deepest Spot on Earth

Finding the deepest spot on Earth is challenging due to limited light penetration in water. Sound is used to measure ocean depth by calculating the time it takes for sound to travel to the ocean floor and back. In 1951, scientists discovered the deepest spot 210 miles southwest of Guam in the Mariana Trench, known as the Challenger Deep, which is 36,000 feet down. Only two people have reached this depth, with James Cameron planning a solo dive.

What method is used to measure the depth of the ocean when light cannot penetrate deep enough?

• Measuring sound travel time

• Using a submarine

• Sending divers

• Using a telescope

Where is the deepest spot in the ocean located?

• Near the North Pole

• In the Indian Ocean

• In the Atlantic Ocean

• 210 miles southwest of Guam

What geological feature is revealed by sonar in the Mariana Trench?

• A mountain range

• A volcanic island

• A 1500 mile gash

• A coral reef

What is the name of the deepest point in the Mariana Trench?

• Guam Trench

• Pacific Abyss

• Challenger Deep

• Mariana Deep

Who is one of the few people to have reached the Challenger Deep?

• Buzz Aldrin

• James Cameron

• Jacques Cousteau

• Neil Armstrong