Earth is our home planet, and it's the only place in the universe where we know for certain that life exists. Earth formed over 4.5 billion years ago from a swirling cloud of gas and dust squished ...

The lithosphere is the layer of Earth we call home. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. The lithosphere is the outermost layer of ...

Clouds fill the sky above Austin-Bergstrom International Airport in Austin, Texas. As seen from ground level, the bottom-most clouds are flat. On an overcast day we see the clouds from the bottom ...