The process of sediment being laid down is known as a) melting b)erosion c) deposition d) crystallization

Magma is outside the volcano  and lava is inside the volcano. 

Answercompass direction;

Your answer is d. silli hope this ! : ) i left an explanation down below if you need it: a sill forms when hot magma squeezes between layers of rock to form a hardened sheet of rock. a sill is basically a tabular sheet intrusion between old layers of sedimentary rock, volcanic beds, or in the direction of foliation inherent in metamorphic rock. the word sill means a concordant intrusive sheet.

Just try your best buddy