Imagine a world where all the land ice on Earth melts. It might sound like a scenario for a science fiction movie, but the ...

So scientists have had to look at what the Earth looks like now and at all of the other planets ... massive amounts of dust and broken or melted rock. In fact, scientists believe that the Moon ...

It isn’t easy to figure out how the Earth was built, because it happened 4½ billion years ago, and no one was there to watch. So scientists have had to look at what the Earth looks like now and at all ...