Question

With reference to Intrusive Igneous Rocks which of the following is incorrect?

पर्याय

• Batholiths – deep-seated large deposits of igneous rocks like graphite.

• Hypobyssal Rocks – small rock deposits.

• Neck – a plug at the top of a volcano.

• Dykes – large deposits of cooled magma on the earth’s surface.

Answer 1

Dykes – large deposits of cooled magma on the earth’s surface.

Explanation:

This option is incorrect because dykes are not deposits on the earth’s surface. According to your textbook, dykes are intrusive igneous features formed when magma is forced upwards into vertical cracks of existing rocks and hardens below the earth’s surface. They cut across rock layers vertically, unlike surface deposits formed by lava. Therefore, describing dykes as large surface deposits of cooled magma is wrong.