How is a volcanic sill formed?

Answer

Volcanic sills are a tabular sheet intrusions that break in between older layers of sedimentary rocks, beds of volcanic lava, tuff, or even along the course of foliation in metamorphic rock. They are formed when lava squeezes itself in between rock layers hence forming dykes when lava spreads itself horizontally across rock.
Q&A Related to "How is a volcanic sill formed?"
Volcanic islands are formed when a volcano continually errupts. It spills magma and then lava which as it hits the water cools and forms rock. Eventually the rock builds up until
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In geology, a sill is a tabular pluton that has intruded between older layers of sedimentary rock, beds of volcanic lava or tuff, or even along the direction of foliation in metamorphic
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1 Additional Answer
Sill is a tabular sheet pluton that has intruded between older layers of alluvial rock, beds of volcanic magma or even along the course of foliation in metamorphic rock. Sills are formed when lava forces itself in between rock layers.
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