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Volcanic rock that forms as fluid lava chills rapidly is
called pillow lava. This rapid chilling occurs when lava erupts
directly into water (or beneath ice) or when it flows across a
shoreline and into a body of water. (这些引出话题,知道“pillow lava”就可以了)
While the term ―pillow lava‖
suggests a definite shape, in fact geologists disagree.(说明有两派观点)
Some geologists argue that pillow lava is characterized by discrete,
ellipsoidal masses. Others describe pillow lava as a tangled
mass of cylindrical, interconnected flow lobes. Much of this
controversy probably results from unwarranted extrapolations
of the original configuration of pillow flows from two-
dimensional cross sections of eroded pillows in land
outcroppings.(说明争议的原因,即二维检测的方法是unwarranted,后文说到要用三维的方法)
Virtually any cross section cut through a tangled
mass of interconnected flow lobes would give the appearance
of a pile of discrete ellipsoidal masses. Adequate three-
dimensional images of intact pillows are essential for defining
the true geometry of pillowed flows and thus ascertaining their
mode of origin. Indeed, the term ―"pillow",itself suggestive of
discrete masses, is probably a misnomer. (最后作者否定了第一种观点,)
总结:这篇文章初读来是有些不知所云,主要因为涉及到很多地理地质的学科单词,但是只要抓住这两种观点的关系,就不难看清文章的意图了。
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