1.what is the most abundant element of earth's atmosphere?

Oxygen.

The atmosphere is composed of ~78% nitrogen and ~21% oxygen, with small amounts of other gases. The bulk composition of the earth by weight is mostly, iron, oxygen, silicon and magnesium

Nitrogen

Nitrogen makes up about 78% of the Earth's atmosphere. Oxygen makes up another 21% of it. The remaining fraction is composed of argon, carbon dioxide, and water vapor.

answer; how far out of place which the object finished relative to the starting location;

305.7

explanation:

density =m/v

density =917/3.00

density = 305.

approximately = 305.7

in four significant figures