Approximately how many times denser is the liquid outer core than the solid crust? A. 2
B. 4
C. 5
D. 7

(See attached photo for the graphs to answer the question)

What environmental cues and landmarks do the geese use to determine the timing and direction of their migration over the mountains? how do they find their way?

Why zebra fish experience similar genetic disease as human

What is point source pollution of an aquatic ecosystem? a) pollution of freshwater sources b) pollution from many sources that combine into one c) pollution that occurs over a wide area; water that runs off from fields, parking lots, and other land surfaces d) pollution that can easily be identified with a single discharge source, such as an open pipe which drains into a body of water