The Earth would be as lifeless without the atmosphere. A good atmosphere is an essential part of forming lives on a planet. Take a look at the moon. It lifeless because it dos
have an atmosphere. The atmosphere of Earth is the layer of gases, commonly known as air, that surrounds the planet Earth and is retained by Earth’s gravity. The atmosphe protects life on Earth by absorbing ultraviolet solar radiation, warming the surface through heat retention (greenhouse effect ), and reducing temperature extremes between da
night. Here are some interesting facts about earth’s atmosphere.
1. By volume, dry air contains 78.09% nitrogen, 20.95% oxygen ,0.93% argon , 0.039% carbon dioxide , and small amounts of other gases.And the atmosphere has a mass about 5.15 × 10 18 kg, three quarters of which is within about 11 km (6.8 mi; 36,000 ft) of the surface.
2. The atmosphere becomes thinner and thinner with increasing altitude, with no definite boundary between the atmosphere and outer space. The Kármán line, at 100 km mi), or 1.57% of Earth’s radius, is often used as the border between the atmosphere and outer space.
3. There are five main layers and From lowest to highest, the five main layers are: Troposphere: 0 to 12 km (0 to 7 miles), Stratosphere: 12 to 50 km (7 to 31 miles), Mesosp 50 to 80 km (31 to 50 miles), Thermosphere: 80 to 700 km (50 to 440 miles), and Exosphere: 700 to 10,000 km (440 to 6,200 miles).
4. The troposphere is the lowest layer of Earth’s atmosphere. It extends from Earth’s surface to an average height of about 12 km, although this altitude actually varies from about 9 km (30,000 ft) at the poles to 17 km (56,000 ft) at the equator, with some variation due to weather.
5. The lowest part of the troposphere (i.e. Earth’s surface) is typically the warmest section of the troposphere.
6. The troposphere is denser than all its overlying atmospheric layers because a larger atmospheric weight sits on top of the troposphere and causes it to be most severe
compressed. Fifty percent of the total mass of the atmosphere is located in the lower 5.6 km (18,000 ft) of the troposphere.
7. when sulphur dioxides or nitrogen oxygen oxides combine with water vapours in the atmosphere. As a result they form acids which kills plants, animals, and entire forest.
8. Atmosphere’s balance is menaced by human activity, which causes green house effect, global warming, air contamination, ozone belt destruction and acid rains. These effects are mainly due to development of industries. The burning of the fossil fuel produces carbon dioxide, the main green house effect gas.
9. Auroras are shimmering curtains of light seen at night in the polar regions. They are known as the Northern Lights in the Arctic, and as the Southern Lights in the Antarc. These spectacular displays are caused by charged particles from the Sun striking the upper atmosphere above the poles.
10. Blue light is scattered more than other wavelengths by the gases in the atmosphere, giving Earth a blue halo when seen from space onboard ISS at a height of 402–424m.
11. About 20% of the Earth’s population breathes severely contaminated air, especially with carbon monoxide and sulfur dioxide resulting from industrial processes. This increases the number of respiratory conditions, especially among children and elders.
12. The frequency of skin cancer is causes by thinning of ozone layer. This is due to chlorinated hydrocarbons and fluorocarbons from aerosols, fridges, detergents, and polystyrene. These gases rise into the atmosphere and decomposed into chloride ions that destroys the ozone layer.