7.Waterfalls typically form in the Single choice. Upper course

Lower course

Middle course

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Themes; subfields is the answer

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.

This question has already been answered by someone else.here is a link.  hope that it .

Pretty ssure the answer re her answer is b hope this : )