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sonar

Sonar
Image: NOAA Okeanos Explorer Program

Sonar

How can we see beneath the ocean waves? By hearing. Since sound travels farther through water than light or radar, we send out pulses of sound and analyze the echoes.

But this technique, known as sonar, is not uniquely human. Sonar gives whales, bats and many other animals a hi-def look at their surroundings.

NOAA
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Scientists ‘See’ Ocean Floor via Sonar

Scientists ‘See’ Ocean Floor via Sonar

Marine scientists are using sonar to map, not only seabeds, but fish and plant life, as this video shows. More...

Video
National Geographic
Undersea Mountains March Into the Abyss

Undersea Mountains March Into the Abyss

Sonar images of the Tonga Trench have revealed a violent process: Tectonic action is "dragging giant volcanoes into a chasm in the seabed." Take a look. More...

Article
BBC
Wow! Moths Jam Bat Sonar

Wow! Moths Jam Bat Sonar

It’s not just in “Roadrunner” cartoons. When predators develop a strategy, their prey often develop a counter-strategy. Some moths, for example, mess up bat sonar. More...

Article
LiveScience
Experiment with Sonar

Experiment with Sonar

Sonar uses sound waves to build a picture by their echo. Take a look at how it's used to "see" a lake bottom or sea floor. More...

Interactive
NOVA/PBS
How Whales and Dolphins Focus Sound Beams on Prey

How Whales and Dolphins Focus Sound Beams on Prey

Toothed whales can pinpoint focused beams of sound to locate prey. One dolphin is so good at it, she can distinguish between two objects that vary in width by the thickness of a human hair. More...

Article
BBC
Human Echolocation: Using Tongue-Clicks to Navigate the World

Human Echolocation: Using Tongue-Clicks to Navigate the World

Dolphins and bats aren’t the only creatures that “see” with sonar. As this article and video shows, some blind people are learning to do the same thing, using nothing but their mouths and ears. More...

Video
BBC
Hunt for the USS Alligator

Hunt for the USS Alligator

In 1863, the Navy's first submarine, the USS Alligator, sank off the coast of North Carolina. This video records an attempt to find it, using sonar, in 2005. More...

Video
NOAA
Sonar Quiz

Sonar Quiz

Striking your brain, one after another, the questions in this quiz will reveal what you know about sonar. More...

Interactive
SoftSchools.com
Sounding the Deepest Spot on Earth

Sounding the Deepest Spot on Earth

About 7 miles below the Pacific Ocean’s surface lies the deepest spot on Earth — more than a mile deeper than Mt. Everest is high. How do we know? Because of sonar. More...

Video
National Geographic
Soundings: Mapping the Ocean Floor

Soundings: Mapping the Ocean Floor

Show how sonar works using little more than a stopwatch, a tennis ball, and a long strip of paper (which the site calls "adding machine tape" because, well, it's a bit old). More...

Activity
education.com

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