If the variation of temperature is given by the function
t=280.0+0.002x^2+0.004y^2+0.0098z, compute the change in
temperature for a displacement of 100m in the northwesterly
direction and 50m in the vertical direction.

It’s either c or d as the answer.

The answer is the magnetosphere.

How is this even a question?

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.