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1、1. Wind velocity also increases with altitude and may cause serious stress for trees, as is made evident by the deformed shapes at high altitudes.2. For example, some early societies ceased to consider certain rites essential to their well-being and abandoned them; nevertheless, they retained as par
2、ts of their oral tradition the myths that had grown up around the rites and admired them for their artistic qualities rather than for their religious usefulness.3. if the pores are large, the water in them will exist as drops too heavy for surface tension to hold, and it will drain away; but if the
3、pores are small enough, the water in them will exist as thin films, too light to overcome the force of surface tension holding them in place; then the water will be firmly held.4. The extreme seriousness of desertification results from the vast areas of land and the tremendous numbers of people affe
4、cted, as well as from the great difficulty of reversing or even slowing the process.5. The structure of the backbone shows, however, that Ambulocetus swam like modern whales by moving the rear portion of its body up and down, even though a fluke was missing.6. He refused to develop projection techno
5、logy, reasoning that if he made and sold projectors, then exhibitors would purchase only one machine-a projector-from him instead of several.7. In order for the structure to achieve the size and strength necessary to meet its purpose, architecture employs methods of support that, because they are ba
6、sed on physical laws, have changed little since people first discovered them-even while building materials have changed dramatically.8. Estimates indicate that the aquifer contains enough water to fill Lake Huron, but unfortunately, under the semiarid climatic conditions that presently exist in the
7、region, rates of addition to the aquifer are minimal, amounting to about half a centimeter a year.9. Even the kind of stability defined as simple lack of change is not always associated with maximum diversity.10. In addition to finding an increase of suitable browse, like huckleberry and vine maple,
8、 Arthur Einarsen, longtime game biologist in the Pacific Northwest, found quality of browse in the open areas to be substantially more nutritive.11. Perhaps, like many contemporary peoples, Upper Paleolithic men and women believed that the drawing of a human image could cause death or injury, and if
9、 that were indeed their belief, it might explain why human figures are rarely depicted in cave art.12. Continued sedimentationthe process of deposits settling on the sea bottomburies the organic matter and subjects it to higher temperatures and pressures, which convert the organic matter to oil and
10、gas.13. This scenario begins with the planting of hyper accumulating species in the target area such as an abandoned mine or an irrigation pond contaminated by runoff.14. Contrary to the arguments of some that much of the Pacific was settled by Polynesians accidentally marooned after being lost and
11、adrift, it seems reasonable that this feat was accomplished by deliberate colonization expeditions that set out fully stocked with food and domesticated plants and animals15. At one time, the animals present in these fossil beds were assigned to various modern animal groups, but most paleontologists
12、 now agree that all Tommotian fossils represent unique body forms that arose in the early Cambrian period and disappeared before the end of the period, leaving no descendants in modern animal groups.16. Only the last of these was suited at all to the continuous operating of machines, and although wa
13、terpower abounded in Lancashire and Scotland and ran grain mills as well as textile mills, it had one great disadvantage: streams flowed where nature intended them to, and water-driven factories had to be located on their banks, whether or not the location was desirable for other reasons.17. But as
14、more and more accumulations of strata were cataloged in more and more places, it became clear that the sequences of rocks sometimes differed from region to region and that no rock type was ever going to become a reliable time marker throughout the world.18. Physiological immaturity may be part of wh
15、y infants and toddlers do not form extremely enduring memories, even when they hear stories that promote such remembering in preschoolers.19. As a result of crustal adjustments and faulting, the Strait of Gibraltar, where the Mediterranean now connects to the Atlantic, opened, and water cascaded spe
16、ctacularly back into the Mediterranean.20. Like the stones of a Roman wall which were held together both by the regularity of the design and by that peculiarly powerful Roman cement, so the various parts of the Roman realm were bonded into a massive, monolithic entity by physical, organizational, and psychological controls.21. Unlike in the Americas, where metallurgy was a very late and limited development, Africans had iron from a relatively early da
