51. Unlike most of the worlds volcanoes, they are not always found at the boundaries of the great drifting plates that make up the earths surface; on the contrary, many of them lie deep in the interior of a plate.
52. The relative motion of the plates carrying these continents has been constructed in detail, but the motion of the plates with respect to another cannot readily be translated into motion with respect to the earths interior.
53. As the dome grows, it develops seed fissures ; in at least a few cases the continent may break entirely along some of these fissures, so that the hot spot initiates the formation of a new ocean.
54. While warnings are often appropriate and necessary--the dangers of drug interactions, for example--and many are required by state or federal regulations, it isnt clear that they actually protect the manufacturers and sellers from liability if a customer is injured.
55. At the same time, the American Law Institute--a group of judges, lawyers, and academics whose recommendations carry substantial weight--issued new guidelines for tort law stating that companies need not warn customers of obvious dangers or bombard them with a lengthy list of possible ones.
51.跟世界上的大多数火山不同的是,它们并不总是在由构成地球表面巨大漂流板块之间的边界上出现;相反,它们中有许多位于一个板块较纵深的内部。
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