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By Cox, Kilian, Leighton, Shamoon

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Further production in the system decreases the growth of the system. Such negative feedback causes self-regulation in a natural system, stabili zing and maintaining the system. Think of a weight-loss 10 Ch a pt er 1 Essentia ls of Geography diet-the human body is an open system. When you stand on the scales, the good or bad news reported about your weight both act as negative feedback to you. This, in turn, provides you with guidance (negative feedback) as to how inputs (food Calories) need to be adjusted (such as not buying and eating that burrito grande in the college cafeteria), or how exercise and increased metabolism is needed to burn excess Calories.

1995), p. 175. Chapter 1 === 2:;0 Essentials of Geography 21 GPS: A Personal Locator The Global Positioning System (GPS) comprises 24 orbiting satellites, in six orbital planes, that transmit navigational signals for Earth-bound use (backup GPS satellites are in orbital storage as replacements). Originally devised in the 1970s by the Department of Defense for military purposes, the present system is commercially available worldwide. A smal l receiver, some about the size of a pocket radio, receives signals from four or more satellites at the same time, calculates latitude and longitude within 10-m accuracy (33 ft) and elevation within 15m (49ft), and disp lays the results.

He succeeded, against all odds, in using tl1e fourth-temporal-dimension to link points on the three-dimensional globe. t From that time it was possible to determine longitude accurately on land and sea, as long as everyone agreed upon a meridian to use as a reference for time comparisons-the Royal Observatory in Greenwich, England. In tlus modern era of atomic clocks and satellites in mathematically precise orbits, we have far greater accuracy available for the determination oflongitude on Eartl1's surface and a basis for precise navigation.

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