Why is studying lava flows so important? About that cellphone situation. That stuff really happens out there when performing field research. Describe one time when you were doing something and a part of the plan failed and you had to improvise.

The answer i think is d

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.