cannot cause a suture to develop
has no effect on where a suture will occur
cannot provide information about the nature of underlying rocks
is similar on the two sides of a rift unless a suture divides the two sides
is usually different from the composition of underlying rocks
18. It can be inferred from the passage that the Other geologists would be most likely to agree with which of the following statements?
Similar geological features along both sides of a possible suture imply the existence of that suture.
Sutures can be discovered only where they are not obscured by superimposed geological features.
The composition of igneous rocks permits prediction of the likelihood of a rift developing through them.
It is possible to date igneous rocks by carefully studying the different kinds of rare metals contained in them and by observing their similarity to the layer of rock that lies above them.
The existence of rock layers on one side of a rift that are similar in composition to rock layers on the other side suggests that no suture exists between the two sides.
19. It can be inferred from the passage that Harris and Gass have done which of the following?
Drawn detailed diagrams of the Red Sea rift.
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