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21 Nov 2009
It was many years before the proof of seafloor spreading and relative continental movement was broadly accepted by the geoscience community; the proof was in place by 1965, but the theory of plate tectonics that evolved from these discoveries was not embraced until the early 1970s.
Even the ocean has freshwater springs, and at these springs, freshwater can be taken right off the surface of the sea. Absolutely pure water is not actually clear and transparent in colour. It is actually blue!
Approximately 70 percent of the Earth is covered with water. Only 1 percent of the water is drinkable.
The mass of the Earth is roughly 6,700 million, million, million tons.
The 1918 flu, which infected 28 percent of people in the United States, killed 675,000 Americans. More than 20 million people died worldwide, most of them young adults.
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