She considers the mechanism behind these sudden cold spells important because the climate changes are so rapid. While we cannot predict the future, we can learn from events in the past and see how they occurred. If change is abrupt, crops fail, rains do not come or come too frequently and people do not have time to adjust. Copyright 1998, Spacer. Climate variation and the rise and fall of an Andean civilization.
Paleolake levels provide estimates of drainage basin water balance.
Archaeological evidence establishes spatial and temporal patterns of agricultural field use and abandonment. Prior to 1500 B.C., aridity in the altiplano precluded intensive agriculture. 1997 University of Washington. There is a network of camera stations for detecting bright meteors, covering parts of Germany, the Czech Republic, the Netherlands and Slovakia. The fireball of January 25 was not exceptionally bright.