nitrogen
Two examples are nitrogen (N2) and oxygen (O2).
No, the Nitrogen in the air has probably always been there (because nitrogen is rather inert), but originally Earths atmosphere was reducing (it had no free Oxygen) and probably contained large amounts of CO2 and hydrocarbons. The present atmosphere on Earth is the product of biological processes which have slowly introduced free Oxygen into the Oceans and then the atmosphere - life made Earth habitable for life!
The gas molecule is ozone (O3). It is formed when oxygen (O2) molecules are split apart by ultraviolet radiation in the upper atmosphere and then recombine to form ozone. Ozone helps to protect Earth from harmful ultraviolet radiation from the sun.
That's simply the way earth's atmosphere evolved. And fortunate for us - if the earths atmosphere was 100% oxygen, the planet would have burst into flames long ago! Earth's atmosphere is 79% Nitrogen.
It is believed that the early Earth's atmosphere did not contain significant amounts of oxygen. Oxygen began to accumulate in the atmosphere around 2.4 billion years ago due to the emergence of photosynthetic organisms.
The element "Oxygen".
Nitrogen is about 79% of the Earth's atmosphere.
Nitrogen is the largest component of Earth's present atmosphere, making up about 78% of the total gases in the atmosphere.
Carbon dioxideMethaneNitrous Oxide
Two examples are nitrogen (N2) and oxygen (O2).
Ozone layer protects us. It is present in the stratospheric region of atmosphere.
There is good ozone and then there is bad ozone. Good ozone is present in the earth's atmosphere.
Oxygen makes up about 21% of Earth's lower atmosphere by volume.
The approximate percent of oxygen in Earth's lower atmosphere is around 20.95% by volume.
The approximate percentage of oxygen in Earth's lower atmosphere is around 21% by volume.
Earth's present atmosphere is believed to have originated from volcanic activity early in the planet's history. Volcanoes released gases such as water vapor, carbon dioxide, and nitrogen, which eventually formed the atmosphere over billions of years.
The density of Earth's atmosphere decreases with altitude. As you move higher up in the atmosphere, there are fewer molecules of gases present, leading to lower density.