Construction bidding. Construction bidding is the process of submitting a proposal (tender) to undertake, or manage the undertaking of a construction project. The process starts with a cost estimate from blueprints and material take offs.
In the Earth's crust, the most common elements are:    Oxygen 46.1%   Silicon 28.2%   Aluminum 8.23%   Iron 5.63%   Calcium 4.15%   Sodium 2.36%  â¦  Magnesium 2.33%   Potassium 2.09%   Titanium 0.565%   Hydrogen 0.14%   In the atmosphere, the most common elements are Nitrogen and  Oxygen.he most common gas in the earth's atmosphere is in fact, nitrogen, with it making up 78% of the air you're breathing right now. However, oxygen does make up 21% of the air. + 57 others found this useful.
Quick Answer. 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.