Relief sculpture is sculpture that protrudes from a flat surface or plane. These sculptures can be made out of earth, stone or other various hard substances, and they are often carved into the sides of buildings or other objects. Keep Learning.
A scientists takes a sample of water from a mine deep underground in Ontario, Canada. The water turned out to be 2.6 billion years old, the oldest known water on Earth. Credit: B. Sherwood Lollar et al. Last month, scientists announced they had found an ancient pocket of water buried in a mine 2 miles below Earth's surface. The water, up to 2.6 billion years old, may have been around longer even than multicellular life. The find raises intriguing possibilities for understanding how life arose on Earth and if it could survive on other planets. But the really burning questions is, of course, what does it taste like?
If Earth was the size of a basketball, all of its water would fit into a ping pong ball. How much water is that? It's roughly 326 million cubic miles (1.332 billion cubic kilometers), according to a recent study from the U.S. Geological Survey. Some 72 percent of Earth is covered in water, but 97 percent of that is salty ocean water and not suitable for drinking. There's not a lot of water on Earth at all, said David Gallo, an oceanographer at the Woods Hole Oceanographic Institution (WHOI) in Massachusetts.