GED Science : Earth Science
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Example Questions
Example Question #1 : Atmosphere And Air
What is the most prevalent gas in the earth's atmosphere?
Hydrogen
Carbon dioxide
Nitrogen
Oxygen
Nitrogen
The air in the atmosphere is largely composed of nitrogen and oxygen. Nitrogen represents the largest contributor, composing approximately 79% of the earth's atmosphere. Oxygen represents about 20% of the earth's atmosphere. Other gases, such as hydrogen, carbon dioxide, and methane, comprise less than 1% of the atmosphere.
Example Question #1 : Earth And Space Science
Which noble gas, commonly used at children's birthday parties, is currently considered to be in limited supply?
Helium
Neon
Hydrogen
Argon
Helium
Helium is frequently used in balloons at parties. It is lighter in mass than the surrounding air, allowing it to "float" upwards. As a noble gas, helium is also largely inert and has numerous practical purposes in chemistry due to this property.
Beginning in 2013, the amount of helium used began to far exceed the supply, resulting in a helium shortage.
Neon and argon are noble gases (like helium). Hydrogen is not a noble gas, and is actually highly reactive.
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