And although you can't build from Planning Sets, they will allow you to gather bids from contractors, arrange your furniture in the plan, analyze traffic patterns and gauge the site lines on your lot.
A: Earth's atmosphere, which is around 300 miles thick, is mainly made of nitrogen and oxygen, although there are many other trace substances in its composition. Trace substances make up only 1 percent of the bulk of the atmosphere while nitrogen (78 percent), oxygen (21 percent) and argon (1 percent) make up the rest. Continue Reading
The Earth's atmosphere is mainly composed of the diatomic molecules oxygen (about 78%) and nitrogen (about 21%). The subscript 2 of oxygen and nitrogen indicates the number of oxygen atoms and nitrogen atoms. So the oxygen molecules present in the atmosphere have two oxygen atoms and the nitrogen molecules have two nitrogen atoms. There are also other diatomic molecules that we encounter every day.