How old is the Earth? - Mystery Science

Watch the video to discover the answer to "How old is the Earth?" and don't forget to vote for next week's question!

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How much water is in the world?

Videos on Icebergs and Oceans “What’s Below the Tip of the Iceberg?” (4:51) — Learn how icebergs form and move and create floating islands of fresh water where unexpected life can flourish. “How Big Is the Ocean?” (5:25) How much water is in the ocean? A lot. Hiding under all that water are the world’s longest mountain chain, largest waterfall (yes, it’s underwater), tallest ...