Deserts can be hot and dry, like the Sahara, or cold and dry, like Antarctica.
El Niño and La Niña are parts of a climate cycle that has implications for weather around the planet.
Invasive species, introduced by accident or on purpose, can wreak havoc on native ecosystems.
Earth's four seasons are caused by the yearly revolution of the planet around the sun and its tilt.
These Behind the Scenes articles were provided to LiveScience in partnership with the National Science Foundation.