Showing posts with label coolness. Show all posts
Showing posts with label coolness. Show all posts
Thursday, March 8, 2012
Monday, May 30, 2011
Density of Earth
Earth's density is about 5.5 gram per cubic centimeter, which, compared to water (1.00 g/cm3) is pretty high -- Earth has a thick rocky crust and mantle above a metal core of iron and nickel, very dense.
Wednesday, July 8, 2009
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