4. The Hawaiian Islands are composed of linear chains of which of these types of

Question

4. The Hawaiian Islands are composed of linear chains of which of these types of volcano?

A. Cinder cones

B. Shield volcanoes

C. Stratovolcanoes

D. Lava domes

Rock Types 5. What is the difference between the two types of igneous rocks?

A. The ages of the rocks. Intrusive rocks are always older

B. Extrusive rocks were formed in water, intrusive rocks were not

C. Intrusive rocks were formed in water, extrusive rocks were not

D. Intrusive rocks were formed in the Earth, extrusive rocks were not

6. Why are there no rock layers younger than the Kaibab formation within the stratigraphic section shown?

A. All the rock layers are younger than the Kaibab formation

B. The Kaibab formation was the last layer to be deposited

C. The Colorado River eroded younger layers

D. The Great Unconformity is younger

Explanation / Answer

Ans 4) B- Shield Volcanoes

Explanation- The Hawaiian islands has numerous gently sloping volcanoes formed of less viscous lava.

Ans 5) A- Intrusive rocks are always older.

Explanation- Intrusive rocks are predominantly found in continental plates. Now we know that continental plates are never subducted. Therefore in comparison, intrusive rocks like granite are very old than most extrusive formation.

For the last question we need to see the stratigraphy section.

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