Each statement describes how an intrusive feature appears...

Each statement describes how an intrusive feature appears when exposed at Earth's surface due to erosion. Name the feature. a. A dome-shaped mountainous structure flanked by upturned layers of sedimentary rocks. b. A vertical wall-like feature a few meters wide and hundreds of meters long. c. A huge expanse of granitic rock forming a mountainous terrain tens of kilometers wide. d. A relatively thin layer of basalt sandwiched between layers of sedimentary rocks exposed on the side of a canyon.

Each statement describes how an intrusive feature appears when exposed at Earth's surface due to erosion. Name the feature.
a. A dome-shaped mountainous structure flanked by upturned layers of sedimentary rocks.
b. A vertical wall-like feature a few meters wide and hundreds of meters long.
c. A huge expanse of granitic rock forming a mountainous terrain tens of kilometers wide.
d. A relatively thin layer of basalt sandwiched between layers of sedimentary rocks exposed on the side of a canyon.

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Key Concepts

Sill

A sill is a tabular intrusive body that is emplaced parallel to the bedding of the surrounding sedimentary rocks. It forms when magma intrudes between layers without cutting across them, resulting in a relatively thin, horizontal layer that may become visible along exposed canyon walls or other erosional features.

Laccolith

A laccolith is an intrusive igneous body that forms when magma intrudes between layers of sedimentary rock, causing the overlying strata to dome upward. This results in a distinct, convex shape at the surface, indicating the upward push of the magma during its emplacement.

Dike

A dike is a sheet-like body of magma that forces its way through existing rock layers, cutting across them. Typically vertical or steeply inclined, dikes are recognized by their narrow, elongated appearance and represent pathways for magma moving through fractures in the Earth's crust.

Batholith

A batholith is a very large, deep-seated intrusive body composed of coarse-grained igneous rock, usually granitic in composition. These massive formations are emplaced over extensive areas and become exposed at the surface after significant erosion of the overlying rock, often forming extensive mountainous regions.

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