28 (Xinhua) -- Australian researchers have discovered than seawater cycles much further below the Earth's surface than first thought, reopening the age-old question about how oceans formed. Researchers at the Australian National University (ANU) found that ocean water cycled up to 2,900 kilo...
the available evidence suggests that over Earth's entire 4.6-billion-year history there has not been enough volcanic activity to produce an ocean. But in retrospect the whole volcanic“out gassing" scenario rested on a misconception. it is simply not possible for a planet to grow quietly.coolly...
Use this quiz/worksheet combo to help you test your understanding of how oceans were formed. Some of the information you'll be assessed on includes identifying reasons the Earth continues to have liquid surface water as well as determining the age of the planet's oceans. ...
B.To give a reason why Earth's oceans must have formed gradually over billions of years C.To introduce an idea that helps explain why the traditional view of ocean formation is probably not correct D.To explain why there has not been enough volcanic activity over Earth's history to produce...
Understand how the ocean is formed 翻译结果4复制译文编辑译文朗读译文返回顶部 Learn about the ocean and how they shape theLearn about the ocean and how they shape the 翻译结果5复制译文编辑译文朗读译文返回顶部 Understood how the sea is does form ...
On the basis of geophysical observations, this hypothesis suggests that 10 to 15 million years ago an ocean ridge extended eastward from the present position of the Galapagos Islands. This ridge split lengthwise as a rift zone grew from the eastern end. The southern half remained at its ...
What's all about Siwa is that it's located here, completely isolated in the Egyptian portion of the Sahara desert.外界只知道锡瓦坐落在此，完全隔绝在埃及境内的撒哈拉沙漠中。The nearest big city is 460 kilometres away in Alexandria, and the ocean at its closest is 260 kilometres away.离它最近...
B.how an island rose up in the seaC.how soil was formed on a new islandD.how life began on a volcano-produced island答案D解析:文章从火山爆发讲起,谈到岛屿的形成,岛上沙土的形成,植物的产生以及随后动物的产生,所以文章的中心是“生命的产生”。
How was the Gulf Stream formed? Oceanography: Oceanography is the study of all activities and features in the ocean, including physical, chemical, and biological. These activities involve the history of the ocean, plant and animal life, and any other marine life. Some of the ocean's physical...
If winds affect only the upper 100 meters (328 feet) of water, how are deeper ocean currents formed? Find out on the next page. Current Catastrophes Before much was known about ocean currents, sailors would stop their boats for the night only to wake up extremely confused when they found ...