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发布时间：2006-06-22 13:26     点击：

    (B) describe and explain the formation of the oceans and continents

    (C) explain how to estimate the age of lava flows from extinct volcanoes

    (D) describe hot spots and explain how they appear to influence and record the motion of plates

    (E) describe the formation and orientation of island chains in the Pacific Ocean

    21. According to the passage, hot spots differ from most volcanoes in that hot spots

    (A) can only be found near islands

    (B) are active whereas all other volcanoes are extinct

    (C) are situated closer to the earth's surface

    (D) can be found along the edges of the plates

    (E) have greater amounts of alkali metals in their lavas

    22. It can be inferred from the passage that evidence for the apparent course of the Pacific plate has been provided by the

    (A) contours of the continents.

    (B) dimensions of ocean hot spots

    (C) concurrent movement of two hot spots

    (D) pattern of fissures in the ocean floor

    (E) configurations of several mid-ocean island chains

    23. It can be inferred from the passage that the spreading out of lavas of different ages at hot spots indicates that a

    (A) hot spot is active

    (B) continental plate has moved

    (C) continental rupture is imminent

    (D) hot spot had been moving very rapidly

    (E) volcano contains large concentrations of alkali metals

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