Describe at least one part of the experimental procedure that you thought was essential to getting good results. did you find that certain steps in the procedure had to be followed carefully in order to get consistent results? if you wanted better results, do you think there is a step that could have been added to the procedure?

why is arctic sea ice important? arctic sea ice keeps the polar regions cool and moderate global climate. sea ice has a bright surface; 80 percent of the sunlight that strikes it is reflected back into space. as sea ice melts in the summer, it exposes the dark ocean surface.

the answer is:  

line graphs show patterns in data with variables that change over time; whereas, circle graphs show data as parts out of a whole (such as out of 100%).