【题目】 Explorers starte d making navigation(导航) charts showing how wi d e th e ocean w as mor e than 500 years ago . But it's much harder to calculat e how deep it is .In 1872 th e HMS Challenger, a British Navy ship , set sail to learn about th e ocea n , including ...
How deep is the ocean? The Challenger Deep is the deepest known point in the Earth’s oceans. Related: Kathryn Sullivan, the first American woman to walk in space now the first woman to reach the deepest point of the ocean Sources
How deep is the ocean? Today's special edition of CNN 10 takes you to the deepest part of the world's deepest trench in the world's deepest ocean. You'll meet a man who recently went there, and you'll hear his views on the importance of exploring the deep blue sea....
How deep is the ocean thermocline?ThermoclineA thermocline is a layer in a body of water where there is a steep drop in temperature (as water gets deeper). The drop in temperature in the thermocline is much more drastic than in the layers above or below....
Today scientists know that on average the ocean is 2.3 miles (3.7 km) deep, but many parts are much shallower or deeper. To measure depth they use sonar, which stands for Sound Navigation And Ranging. A ship sends out pulses of sound energy and measures depth based on how quickly the so...
A deep-sea submersible -- part of an international undersea observation program -- has been attacked by a massive creature and lies disabled at the bottom of the deepest part of the Pacific Ocean with its crew trapped inside. 'The Meg' is here and she's pleased to eat you By 2019, he...
Lake Baikal in Siberia is the deepest lake in the world, at 5,387 feet (1,642 meters) deep. avdeev007/Getty Images A lake is a body of water like a puddle — water accumulates in a low place in the landscape, either from groundwater coming to the surface, or runoff from rivers ...
Basically, chemistry in the deep ocean stabilizes the concentrations of calcium and carbonate in the seawater, which is why the upper part of the ocean is saturated with calcium and carbonate (and perfect for shell-building) to begin with.基本上，深海中的化学物质可以稳定海水中的钙离子和碳酸根...
While scientists continue to explore outer space, how much of the ocean is still unexplored? And what is the deepest part of the ocean?
The deep ocean is an extremely difficult place to observe, let alone to visit. The challenges of deep ocean exploration are of the darkness as water scatters and absorbs light. Another barrier is the weight of water itself, pressure increases by one atmo