14.3 Intrusive Formations Review

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What is a Dike?

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A dike is a type of intrusive formation that cuts across existing rock layers, typically formed from magma that has intruded into fractures.

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What is a Sill?

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A sill is a horizontal or nearly horizontal sheet of igneous rock that forms when magma intrudes between layers of pre-existing rock.

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What is a Laccolith?

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A laccolith is a dome-shaped intrusive formation that forms when magma pushes up the overlying rock layers, creating a bulge.

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What is a Batholith?

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A batholith is a large mass of intrusive igneous rock that has solidified deep within the Earth's crust, often forming the cores of mountain ranges.

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What is a Stock?

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A stock is a smaller body of intrusive igneous rock that is similar to a batholith but covers less area.

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What is Mountain-Building?

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Mountain-building is a geological process that involves the formation of mountains through tectonic forces, including the intrusion of magma.

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What is the relationship between Plutons and Intrusive Formations?

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Plutons are large bodies of intrusive igneous rock, and they include formations such as batholiths, stocks, sills, and dikes.

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How does a Batholith differ from a Dike?

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A batholith is a large, deep-seated intrusive formation, while a dike is a smaller, vertical or steeply inclined intrusion that cuts across rock layers.

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What type of texture do Batholiths typically have?

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Batholiths usually have a coarse crystal texture due to their slow cooling process deep within the Earth.

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What is the significance of Sills in geology?

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Sills are significant as they can indicate the direction of magma movement and the geological history of an area.