Geography College

fill in the blank. an igneous intrusion that is parallel to layers in the host rock is a(n) ___. a(n) is a sheet like intrusion that cuts across any layers present in the host rock. a(n)____ is a lump or bulge-shaped magma body that eventually defines a dome.

Answers

Answer 1

An igneous intrusion that is parallel to layers in the host rock is a sill. A di-ke is a sheet like intrusion that cuts across any layers present in the host rock. A laccolith is a lump or bulge-shaped magma body that eventually defines a dome.

In geology, an igneous intrusion is a body of intrusive igneous rock formed by the crystallization of magma slowly cooling under the Earth's surface. Intrusions come in a broad range of shapes and sizes. Because the solid country rock into which magma intrudes is a superb insulator, cooling of the magma is exceedingly slow, and intrusive igneous rock is coarse-grained. Intrusive igneous rocks are distinguished from extrusive igneous rocks by their mineral content.

Igneous intrusions can arise from a single magmatic event or from a series of incremental occurrences. Large felsic intrusions are most likely formed by melting of the lower crust, which has been heated by an intrusion of mafic magma from the upper mantle.

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