Why is the earth's core so hot? And how do scientists measure its temperature?
Quentin Williams, associate professor of earth sciences at the University of California at Santa Cruz offers this explanation
Rivers of Fire
The SOHO spacecraft finds intricate plasma flows coursing through the sun
I've heard several different answers to this seemingly simple question: what causes the leaves on trees to change color in the fall?
Why do clouds always appear to form in distinct clumps? Why isn't there a uniform fog of condensation, especially on windy days when one would expect mixing?
Science at Sea
A converted oil exploration ship probes the seabed for clues to climate change and the inner workings of the earth.
What causes the high-speed winds, or "jet stream," in the stratosphere? And why does the path of the jet stream wander?
What is the meaning of the phrase, "It is too cold to snow"? Doesn't it have to be cold for it to snow?
What do we know about the origin of the earth's oceans? Is it more likely that they derive from icy comets that struck the young earth or from material released from the earth's interior during volcanic activity?
Why are rainbows curved? Is it because of refraction in the drops of water?
Interview with Barry Commoner
A leading environmentalist reviews his long, contentious past and sets new directions for the future
Animal Research Is Vital to Medicine
Patricia D. Moehlman
Into the Wilds of Africa
Pacific Ocean Surface Winds
Typhoon Violet at Japan
Typhoons Violet and Tom
Global Wind-Speed Averages
Blowing in the Wind
The Inside Story
Detailed computer simulations help scientists delve into the Earth's interior