Earth is the only planet in our solar system that has an atmosphere suitable for biological life. Mercury, Venus, Mars, Jupiter, Saturn, Uranus, Neptune, and the dwarf planet Pluto are not suitable for biological life as we know it.
Air as we call it surrounds the earth just above the land and sea. It is often called the atmosphere. Air seems like nothing, but it is really several gases mixed together. without air, there could be no living plants or animals on the earth. Air is a mixture of gases that we cannot see. water in the form of vapor( separated particles too fine to see) are mixed with the gases. Air also carries tiny particles of solid materials such as dust. But the water and solid particles are not considered part of the air. The most important gases in air are nitrogen and oxygen. Nitrogen makes up slightly more than 78 percent, or almost eight tenths, of dry air by volume. Oxygen accounts for 21 percent or about two tenths of volume of air. The remaining 1 percent of air consists almost entirely of the gas argon. Air also contains very small amounts of several other gases. They include neon, helium, krypton, xenon, hydrogen, ozone, carbon dioxide, nitrous oxide, and methane. In some parts of the world, the air contains small traces of carbon monoxide and hydrogen sulfide.
The atmosphere that surrounds the earth is divided into four layers. These four layers are from the lowest to the highest altitude. The troposphere (from sea level to 10 miles up), stratosphere (from 10 miles up to 30 miles up), mesosphere (from 30 miles up to 50 miles up), and the thermosphere (50 miles up to 300 miles up).
The troposphere is the layer of atmosphere closest to the earth’s surface. The oxygen level is the highest in this layer. The clouds we see are in this layer. The thermosphere is the highest layer of the atmosphere. The ionosphere is centered in the lower thermosphere and extends upward for several hundred miles. It is a region of electrically charged particles. This is were aurora’s can be seen (Northern and Southern lights). The ionosphere plays an important part in radio communication. Radio waves that bounce off it can travel far around the earth.
These layers of atmosphere also act as a shield to protect the earth and us (Psalm 47:9) from the harmful cosmic radiation from our sun and other sources from outer space. God knew what type of atmosphere we needed when He created it on the second day of creation week (Genesis 1:6-8). Without an atmosphere our planet would look like our moon which has no atmosphere. We need to give God thanks (Revelation 4:11) for our home in space that He has provided so graciously for us. Amen!