19.It can be inferred from the passage that Harris and

Gass have done which of the following?

(A) Drawn detailed diagrams of the Red Sea rift.

(B) Based their conclusions on the way in which

sutures develop in the Earth’s crust.

(C) Rejected other geologists objections to their

hypothesis about the Red Sea rift.

(D) Suggested that the presence of rare metals in

rocks indicates an underlying suture.

(E) Asserted that rifts usually occur along the lines

of sutures

20.According to the passage, Harris and Gass have

mentioned all of the following properties of rocks

along the Red Sea rift EXCEPT

(A) age of the upper layers of rock

(B) structure of the upper layers of rocks

(C) geochemical content of the upper layers of rocks

(D) metallic content of the underlying igneous rocks

(E) age of the underlying igneous rocks