Which phrases describe a sill? check all that apply. fills in valleys and rivers is a hardened magma intrusion cuts vertically through older rock layers cuts horizontally through older rock layers is built up by numerous eruptions over thousands of years

The correct answers are:

- is a hardened magma intrusion;

- cuts horizontally through older rock layers;

The sill can always be found as a horizontal layer between older rocks, thus it is not a vertical intrusion, but instead it is a horizontal intrusion, that manages to cut through the older layers of sedimentary rocks, along side the foliation in a metamorphic rock, or beds of volcanic tuff or lava.

The sill can be described as a tabular intrusion, but also as a concordant intrusion, as it is not cutting across the older rock layers.

B and D

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