The extraordinary flat land of the west siberian plain stretches from the ural mountains for how many square miles

It covers around 1,200,000 square miles.

https://www.britannica.com/place/West-Siberian-Plain

Where exactly from michigan?

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.