Word: layers
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What are some examples of computer standards? HTML (short for hypertext markup language), frequently tacked on to the end of web addresses, is one: It describes how web pages are supposed to be drawn up on the screen. Mp3 (short for MPEG-1 audio layer 3, where MPEG is short for Motion Picture Experts Group) is another, which explains how audio files can be compressed and decompressed, so that the makers of digital music players know how to program their devices...
...chemicals that accumulate in cool Arctic waters and build up in the food chain. Other animals are also in trouble. In February, in what should have been midwinter in the far north, Nunavut's capital city, Iqaluit, was a balmy 5*noneC and rainy. When the temperature dropped, a layer of ice froze over the tundra. Now there's fear that the caribou, which normally dig through snow--not hard ice--to get lichen in winter, will be underfed. So the Inuit can expect a significant change in their diet...
That is what scientists call a feedback loop, and it's a nasty one, since once you uncap the Arctic Ocean, you unleash another beast: the comparatively warm layer of water about 600 ft. deep that circulates in and out of the Atlantic. "Remove the ice," says Woods Hole's Curry, "and the water starts talking to the atmosphere, releasing its heat. This is not a good thing...
...Boulder: 'Humans are altering the earth's surface and changing the atmosphere at such a rate that we have become a competitor with natural forces that maintain our climate. WHAT IS NEW IS THE POTENTIAL IRREVERSIBILITY OF THE CHANGES THAT ARE NOW TAKING PLACE.' Indeed, if the ozone layer diminishes over populated areas?and there is some evidence that it has begun to do so, although nowhere as dramatically as in the Antarctic?the consequences could be dire...
...site, perhaps the remnants of a series of ponds, extends far beneath it. "They were in a hurry," he says of the hunters, "and I'd love to catch up with them." He believes the tracks were probably made within a matter of months and preserved when protective layers of silty clay covered the muddy sediment. And it's likely that more tracks remain on several underlying layers. "It's like a layer of pancakes," he says, "and we can only see the jam on the top." Other unusual marks could be from implements; Aboriginal trackers from northern Australia...