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The Earth comprises three principal layers: the dense, iron-rich core, the mantle made of silicate (硅酸盐) that are semi-molten at depth, and the thin, solid-surface crust There are two kinds of crust, a lower and denser oceanic crust and an upper，lighter continental crust found over only about 40 percent of the Earth's surface. The rocks of the crust are of very different ages. Some continental rocks are over 3,000 million years old, while those of the ocean floor are less than 200 million years old. The crusts and the top, solid part of the mantle, totaling about 70 to 100 kilometers in thickness, at present appear to consist of about 15 rigid plates, 7 of which are very large. These plates move over the semi-molten lower mantleto produce all of the major topographical(地形学的)features of the Earth. Active zones where intense deformation occur are confined to the narrow, interconnecting boundaries of contact of the plates.
There are three main types of zones of contact: spreading contacts where plates move apart, converging contacts where plates move towards each other, and transform contacts where plates slide past each other. Newoceanic crust is formed along one or more margins of each plate by material issuing from deeper layers of the Earth' s crust, for example, by volcanic eruptions (爆发) of lava (火山熔岩) at mid-ocean ridges. If at such a spreading contact the two plates support continents，a rift(裂缝) is formed that will gradually widen and become flooded by the tea. The Atlantic Ocean formed like this as the American and Afro-European plates moved in opposite directions. When two plates carrying continents collide, the continental blocks,too light to be drawn down, continue to float and therefore buckle (起褶皱) to form a mountain chain along the length of the margin of the plates.
练习题：
Choose correct answers to the question:
1.The Earth’s crust______.
A.can be classified into two types
B.is formed along the margins of the plates
C.consists of semi-molten rocks
D.is about 70 to 100 kilometers thick
2.The 15 plates of the Earth are formed from ___.
A.the oceanic crusts and continental crusts
B.the crusts and the mantle
C.the crusts and the top and solid part of the mantle
D.the continental crusts and the solid part of the mantle
3.Seriously-deformed zones appear _______
A.whenever the crusts move over mantle
B.when the plates move towards each other
C.in the narrow boundaries where two plates meet
D.to be the major topographical feature of the Earth
4.According to the second paragraph, the formation of the Atlantic Ocean is the example of_______.
A.spreading contacts
B.the influence of volcanic eruptions
C.converging contacts
D.transform contacts
5.This passage is probably_______.
A.a newspaper advertisement
B.a chapter of a novel
C.an excerpt from a textbook
D.a scientific report of new findings
