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Your source for monitoring regional and global changes on our planet through images and stories.

Barberton Mountains, South Africa The mountains around the town of Barberton, South Africa, are rich in both history and prehistory. Referred to as the Barberton Greenstone, these mountains derive their name from their greenish hue, and they comprise what may be the world’s best-known greenstone belt. Plume from Rabaul Volcano Rabaul Volcano, on the northeastern tip of Papua New Guinea’s island of New Britain released a plume of ash and steam on November 20, 2008. Floods in Ethiopia Heavy rains starting on November 2 pushed several rivers in southeastern Ethiopia over their banks. Lava Flow from Erta Ale Range, Ethiopia In early November 2008, a volcano erupted in the Erta Ale Range in northeastern Ethiopia, producing a fresh lava flow. Haze Along the Himalaya Haze continued to hover over northern India and Pakistan in mid-November 2008. Plankton Bloom Surrounds Chatham Islands On November 15, 2008, a bloom of plant-like organisms known as phytoplankton encircled the Chatham Islands. Fires in California Fires bore down on San Fernando and Yorba Linda, California, on November 16, 2008. When it Comes to Sea Level Changing Glaciers, New NASA Technique Measures Up Researchers have used satellite data to make the most precise measurements to date of changes in Alaskan glaciers. Arctic Sea Ice Decline Shakes Up Ecosystems Researchers took advantage of NASA satellite images to show that the microscopic floating plants are teeming in regions of recent ice melt. NASA's Carbon-Sniffing Satellite Sleuth Arrives at Launch Site NASA's first spacecraft dedicated to studying carbon dioxide has arrived at Vandenberg Air Force Base, Calif., to begin final launch preparations.

Studio Jargon

Frequency Response

A graph which shows how a system or piece of equipment or even an environment such as a room responds to different frequencies. Ideally, for audio work the graph should plot a flat line from below 20 Hz to above 20 kHz. In practise this is often not achieved, and the line will fluctuate up and down between these points, indicating that the equipment or environment makes some frequencies louder or quieter than others. Humans have a well documented "non-flat" response and this is the response used to specify the dB(A) scale for determining loudness. The term should not be confused with bandwidth which concerns itself only with the attenuation above an upper limit frequency and below a lower limit frequency and does not concern itself with the range between them.

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