What does the clear plastic covering used in your lab set up ?

The sun's parallax would be 180 degrees, greater than which you can't get.  so a. would be your anwser 

Master planned communities outside of chicago. note: population density means people living in an area per square mile. chicago, an urban and highly populated area has a much more higher density than a desert, amish community, settlement, or nomadic region.

1. antarctica2. saudi arabia

Answer a mineral that contains a combination of silicon, si, and oxygen, o, is a silicate mineral. hope it ^.^