What's a ventifact? A. The side of a sand dune protected from wind
B. A wind-borne deposit of sand
C. A rock formation shaped naturally by wind
D. A wind-borne deposit of nutrient-rich soil

Sam hated the long nights of winter! his mother called him in from playing so early: around 4: 30 pm! it is usually dark out when sam is eating supper. what letter represents the long nights where sam lives? a) a. b) b. c) c. d) d.

Which of the following regions suffers the most from acid rain? a. the area around vancouver c. the area below atlanta b. the area below detroit d. the area above montreal

The inner planets mercury, venus, earth, and mars were formed by