What are Sills and Dykes.....?
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In geography, a sill is a tabular sheet instruction that has intruded between older layers of sedimentary rock, beds of volcanic lava or tuff,a long the direction of foliation in metamorphic rocks. ... In contrast, a dike is a discordant intrusive sheet,which does cut across older rocks.
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Dykes (or dikes) are igneous rocks that intrude vertically (or across), while sills are the same type of rocks that cut horizontally (or along) in another land or rock form. 2 Dykes are discordant intrusions, while sills are concordant intrusions. 3 Dykes and sills form due to pressure, force, and stress from one point of origin ... 4 Both dykes and sills can be magmatic or sedimentary in nature
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