About 21 of the Earth's atmosphere is made up of oxygen.
The approximate percentage by volume of oxygen in Earth's atmosphere at location 2 is around 21%.
The approximate percentage of oxygen in Earth's lower atmosphere is around 21% by volume.
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 Earth's atmosphere is composed of about 21% oxygen. This level is important for supporting life on our planet.
The approximate percentage by volume of oxygen in Earth's atmosphere at location 2 is around 21%.
The approximate percentage of oxygen in Earth's lower atmosphere is around 21% by volume.
The element "Oxygen".
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 percentage of oxygen in the atmosphere is 20.75%. The atmosphere has many other elements that we breathe in besides oxygen. Oxygen needs to be present for life on earth.
The Earth's atmosphere is composed of about 21% oxygen. This level is important for supporting life on our planet.
Nitrogen and oxygen make up about 99% of the Earth's atmosphere. Nitrogen accounts for about 78% and oxygen for about 21%.
Hydrogen makes up about 0.000055% of Earth's atmosphere by volume. Although it is present in very small amounts compared to other gases like nitrogen and oxygen, it plays a crucial role in the chemistry and dynamics of the atmosphere.
Earths atmosphere is rich in Oxygen, some 21% of the air is Oxygen. There is oxygen on other planets, but the percentage comes nowhere close to this. The percentage of Oxygen in earths atmosphere is thought to have been much higher in the past, before animals were about, but after the arrival of plants.
The process primarily responsible for the development of the present percentage of free oxygen in the Earth's atmosphere is photosynthesis. This process is carried out by plants, algae, and cyanobacteria, which convert carbon dioxide and water into oxygen and glucose with the help of sunlight. Over time, this has led to the accumulation of oxygen in the atmosphere to its present level of around 21%.
The earths atmosphere is made up of 78% nitrogen and 21% oxygen