Geologists examine a massive fissure in Arizona and find that may have existed way before it caught public attention.

Some deserts are among the planet's last remaining areas of total wilderness. Yet more than one billion people, one-sixth of the Earth's population, actually live in desert regions. Deserts cover ...

Now, the world is a cold, barren desert with few signs ... trying to figure out. Like Earth and Venus, Mars has mountains, valleys, and volcanoes, but the red planet’s are by far the biggest ...