[DOC] [TLE] Activity 1 Teacher Guide: The Goldilocks Principle [PAR] On earth, two elements, nitrogen ( ) and oxygen ( ), make up almost 99% of the ... 
Certain trace atmospheric gases help to heat up our planet because they... [DOC] [TLE] Atmosphere - The Ozone Hole [PAR] Earth's atmosphere is 78% nitrogen, 21% oxygen, and 1% other gases. ... it 
contains 70 to 80 per cent of the Earth's atmosphere and 99% of the water vapor. [DOC] [TLE] Composition of the Atmosphere | CK-12 Foundation [PAR] Nitrogen and oxygen together make up 99% of the planet's atmosphere. Nitrogen 
makes up the bulk of the atmosphere, but is not involved in geological or... [DOC] [TLE] Composition of the Atmosphere ( Read ) | Earth Science | CK-12 ... [PAR] Aug 14, 2014 ... The atmosphere makes conditions on this planet suitable for living ... Nitrogen 
and oxygen together make up 99% of the planet's atmosphere. [DOC] [TLE] Atmosphere of Mars - Wikipedia [PAR] Nitrogen, 1.89%. Oxygen, 0.146%. Carbon monoxide, 0.0557%. The atmosphere 
of Mars is the layer of gases surrounding Mars. It is composed mostly of ... Mars's 
atmospheric mass of 25 teratonnes compares to Earth's 5148 ... 96% carbon 
dioxide, 1.9% argon, 1.9% nitrogen, and traces of free oxygen, ..... 222: 8199. [DOC] [TLE] 7(a) Atmospheric Composition - Physical Geography [PAR] Table 7a-1 lists the eleven most abundant gases found in the Earth's lower ... Of 
the gases listed, nitrogen, oxygen, water vapor, carbon dioxide, methane, nitrous 
... Together these two gases make up approximately 99% of the dry atmosphere. [DOC] [TLE] Question 'what is the percentage of oxygen on planet mars?' - NASA ... [PAR] The oxygen content of the Martian atmosphere is only 0.13 percent, ... It also 
contains nitrogen and argon and very small amounts of water and methane. [DOC] [TLE] High School Earth Science/The Atmosphere - Wikibooks, open ... [PAR] Earth's atmosphere is a thin blanket of gases and tiny particlestogether called 
air. .... Nitrogen and oxygen together make up 99% of the planet's atmosphere. [DOC] [TLE] About 99% of the atmosphere is composed of nitrogen and oxygen ... [PAR] About 99% of the atmosphere is composed of nitrogen and oxygen. ... the layer 
closest to Earth's surface, contains most of the mass of the atmosphere, including
... [DOC] [TLE] 411B: M1, U1, P2: Permanent Atmospheric Gases - Shodor [PAR] Together, nitrogen and oxygen make up about 99% of the air we breathe. ... dry 
atmosphere that have concentrations above one percent near the earth's surface
... [DOC] [TLE] The Earth and Its Atmosphere [PAR] The earth's atmosphere is mainly composed of nitrogen and oxygen. Although 
our atmosphere extends upward for many hundreds of kilometers, 99% of the... [DOC] [TLE] Visionlearning | Earth Science | Composition of Earth's Atmosphere [PAR] Learn about the composition and structure of Earth's atmosphere. ... Nitrogen and 
oxygen, which make up more than 99% of Earth's atmosphere, have a bigger... [DOC] [TLE] troposphere [PAR] The troposphere is the lowest layer of Earth's atmosphere and site of all weather 
on Earth. ... Most prevalent gases are nitrogen (78 percent) and oxygen (21 
percent), with ... The troposphere contains 99% of the water vapor in the 
atmosphere. [DOC] [TLE] atmosphere - National Geographic Society [PAR] Oct 7, 2011 ... Nitrogen and oxygen account for 99 percent of the gases in dry air, with argon, ... 
The atmosphere of Venus is too thickthe planet's surface... [DOC] [TLE] Atmospheric Composition [PAR] Of the gases listed, nitrogen, oxygen, water vapor, carbon dioxide, methane, 
nitrous ... Together these two gases make up approximately 99% of the dry 
atmosphere. ... The addition of this nitrogen to the Earth's surface soils and 
various water... [DOC] [TLE] Atmosphere Basics Reading [PAR] Over 99% of the mass of the Earth's atmosphere is contained in two layers: the ... 
Two elements, nitrogen and oxygen, make up 99% of the volume

Question: This planet's atmosphere is 99% nitrogen & oxygen
Answer: Earth