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Table 7a-1 lists the eleven most abundant gases found in the Earth's lower atmosphere by volume. Of the gases listed, nitrogen, oxygen, water vapor, carbon dioxide, methane, nitrous oxide, and ozone are extremely important to the health of the Earth's biosphere.The table indicates that nitrogen and oxygen are the main components of the atmosphere by volume.able 7a-1 lists the eleven most abundant gases found in the Earth's lower atmosphere by volume. Of the gases listed, nitrogen, oxygen, water vapor, carbon dioxide, methane, nitrous oxide, and ozone are extremely important to the health of the Earth's biosphere.
The atmosphere is a thin blanket of gases that surrounds the Earth. The Earth's atmosphere comprises nitrogen, oxygen and various trace gases. There are four layers in the atmosphere, each of a different temperature: troposphere, stratosphere, mesosphere and thermosphere. Definition of atmospheric pressure. Atmospheric pressure is the force exerted over the Earth resulting from gravity pulling down on the molecules in the air. The unit of measurement is inches of mercury, or inHg. Atmospheric pressure determines the weather, which occurs in the troposphere.