Planet Earth

Reference Uranium is a naturally radioactive element. It powers nuclear reactors and atomic bombs.

Reference Springtime brings warmer temperatures and a rebirth as nature reawakens.

Reference Winter, the coldest season of the year, comes between autumn and spring. It is associated with plunging temperatures and icy weather, but its impact and timing change according to location.

Here's a look at the chemical element gold, including its properties, atomic structure and history.

Reference Reminding us how powerful Mother Nature is.

Reference A volcano is an opening in Earth's crust where magma breaks through and when erupting can rain down molten rock, ash and gases. There are several types of volcanoes.

Reference Here's how Panagea formed and what it was like from about 320 million to 195 million years ago.

Reference The term “amoeba” refers to simple eukaryotic organisms that move in a characteristic crawling fashion.

Facts and information about the March 11, 2011, earthquake and tsunami that struck Japan.

Reference The Sahara desert is the largest hot desert in the world, covering nearly all of northern Africa.