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A certain igneous rock contains about 25 percent dark silicate minerals. The remainder of the rock is mostly calcium rich plagioclase feldspar. What type of composition does this igneous rock have?




Agranitic


Bbasaltic


Candesitic


Dultramafic

Verified Answer :

A certain igneous rock contains about 25 percent dark silicate minerals. the remainder of the rock is mostly calcium rich plagioclase feldspar. the type of composition does this igneous rock have is: b. basaltic

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Answer:

Option (B)

Explanation:

Basaltic rocks are igneous rocks and are generally dark in color. The particles or grains that are present in these types of rocks are comparatively much finer. They are primarily comprised of nearly 25% of silicate materials and the rest are the minerals such as plagioclase as well as pyroxene, which are mostly rich in calcium. For example, basalt.

These basaltic rocks are mostly extrusive in nature and commonly forms as lava flow and pillow basalt along the mid-oceanic ridge and at the same time. They also sometimes occur as small intrusive bodies.

Thus, the correct answer is option (B).

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