[DOC] [TLE] PDC Test - Atmospheric Observations - Certification & Training ... [PAR] An atom of nitrogen has seven protons, while oxygen has eight. Both elements are nonmetal gases. While nitrogen composes about 78% of our atmosphere, oxygen accounts for about 20%. Argon, helium and other gases are also found in smaller quantities. [DOC] [TLE] Which element comprises most of Earth's atmosphere? | Reference ... [PAR] Nitrogen accounts for most of the Earth's atmosphere in volume. Oxygen ranks 
second. Together, nitrogen and oxygen compose 99 percent of the atmosphere's
... [DOC] [TLE] What makes up the Earth's atmosphere? | Reference.com [PAR] About 78 percent of the Earth's atmosphere consists of nitrogen, and oxygen 
makes up 21 percent. The remaining 1 percent is a combination of argon, water,
... [DOC] [TLE] What Is the Atmosphere Made Of? - Science Terrific! [PAR] There are many things in the atmosphere, but basically it is made up of two different elements which are gases. Measured by volume (not weight) completely dry air contains approximately 78% nitrogen and 21% oxygen with about 1% of everything else. [DOC] [TLE] Atmosphere | Atmospheric Gases | Aerosols | Greenhouse Gases [PAR] Trace gases and aerosols make up the remaining 1% of air. ... 60% of the human 
body, and is the third most abundant element found in the Sun. ... Most of our 
atmosphere is made up of nitrogen (78% by volume) and oxygen (21% by 
volume). [DOC] [TLE] What gas is 78 percent of the earths atmosphere - Answers.com [PAR] The element Nitrogen (N) makes up about 78% of the Earth's atmosphere. 
Nitrogen ... Which gas makes up 20 percent of total air volume in earths 
atmosphere? [DOC] [TLE] Nitrogen is element number 7 on the periodic table. It is a colorless ... [PAR] Nitrogen is a colorless, odorless, and tasteless gas that makes up 78% of the 
earth's atmosphere. ... It constituts 78.1% by volume of the Earth's atmosphere. [DOC] [TLE] BBC - GCSE Bitesize: Composition of the Earth's atmosphere [PAR] air is made up of nitrogen (78%), oxygen (21%) ... These two gases are both 
elements and account for about 99% of the gases in the atmosphere. The 
remaining... [DOC] [TLE] Atmosphere of Earth - Wikipedia [PAR] The atmosphere of Earth is the layer of gases, commonly known as air, that 
surrounds the ... Water vapor accounts for roughly 0.25% of the atmosphere by 
mass. ... by volume in hot, humid air masses, and concentrations of other 
atmospheric gases ... The exosphere is the outermost layer of Earth's atmosphere 
(i.e. the upper... [DOC] [TLE] Introduction to the Atmosphere: Background Material [PAR] Two gases make up the bulk of the earth's atmosphere: nitrogen ( ), which 
comprises 78% of the atmosphere, and oxygen ( ), which accounts for 21%. 
Various trace ... Two elements, nitrogen and oxygen, make up 99% of the volume 
of air. [DOC] [TLE] Abundance of Nitrogen in Earth's Atmosphere [PAR] Why is nitrogen the most common element in the earths atmosphere? The 
answer lies ... 2. it is unreactive with materials that make up the solid earth 3. it is 
very... [DOC] [TLE] What gas makes up the majority of our atmosphere? - Quora [PAR] The remaining 1% is made up mostly of a gas called argon. This means that with 
each breath ... Our atmosphere is made up of 78% Nitrogen, 21% Oxygen and 1
% Argon. So Nitrogen makes up the majority of our ... It's nitrogen 79% by volume
, oxygen 21% by volume, generally we say. If the atmosphere was not here our... [DOC] [TLE] troposphere [PAR] The troposphere is the lowest layer of Earth's atmosphere and site of all weather 
... Most prevalent gases are nitrogen (78 percent) and oxygen (21 percent), with... [DOC] [TLE] What Is Air Made of? | Wonderopolis [PAR] Which element makes up most of the air around you? ... Many people assume 
that air is

Question: By volume, this element makes up about 78% of our atmosphere
Answer: Nitrogen