单词:Eratosthenes Seamount
单词:Eratosthenes Seamount 相关文章
Voice 1 Welcome to Spotlight. Im Anne Muir. Voice 2 And Im Bruce Gulland. Spotlight uses a special English method of broadcasting. It is easier for people to understand - no matter where in the world they live. Voice 1 Aurlie Spadone knows all about
Scientists Explore Underwater Volcanoes 科学家探索海底火山 What covers nearly 29 million square kilometers of this planet beneath the sea? The answer is seamounts. Seamounts are mountains, usually volcanoes, that rise up from the sea floor.
China's manned submersible Jiaolong is now ready to start a deep-sea dive at seamount area in the South China Sea and carry out observation. It comes after an error occurred Thursday on its positioning system. The tasks for the dive on Friday include
How big a stick would you need to measure the planet? A thousand miles long? A million? How about three feet? That ought to be enough to do it, as an ancient Alexandrian man named Eratosthenes figured out. Eratosthenes was a multi-talented man who li
On our last program we discussed a simple experiment run by an Alexandrian named Eratosthenes in the third century B.C. By noting that, at the same time of day, sticks in the ground cast different-length shadows depending on whether they were in a no
Voice 1 Welcome to Spotlight. Im Anne Muir. Voice 2 And Im Bruce Gulland. Spotlight uses a special English method of broadcasting. It is easier for people to understand - no matter where in the world they live. Voice 1 Aurlie Spadone knows all about