陈向东93页 5题

Many geologist theorize that the trail of vocanic craters and cinder cones along the Snake River plain of sourthen Idaho was produced as the North American continent slid west -ward over a stainary"plume' , A vertical channel through which molten rock rose intermittently from the Earth's core to brust through its crust.

  which of the following, if true, tends to support the geologists' theory of how the trail was produced?

d: yhe newest craters and cinder cones are on yhe easten margin of yhe trail.

   答案是d。我看不太懂题。这种自然科学的是不是只有gre 才有呀？

   gmat 不出这种题吧？

take a pencil (a vertical channel) and a book (the north american continent ).

then put your book upon one end of your pencil and move the book towards the right ( westward movement). As result, you will find your pencil on the left side (eastern)of the original point on the book, right ? it is similar to the scientific discovery.