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Earth is a sphere so it doesn't have a perimeter. Circles have perimeters. However, if you wanted to know it's surface area then that is 510,072,000 km².
100m2
Vh
I did not know it was lost! It is very important for the calculation of the area of a circle and such calculations were important to the ancient geometers (people who measured land/earth).
Lets pretend that the Earth is a perfect sphere. Surface area of a sphere = 4(pi)(radius)^2. The radius of earth is 6378.1 km. Plug that into your equation and you'll get your answer.
The Lungs of the Earth is the Amazon Rainforest on the continent of South America.
Your lungs have very large surface area. About 100 square meters or 1100 square feet.
Rainforest
Forests.
These are the lungs of the Earth.
the diaphragm under the lungs contracts and relaxes so that the air enters the lungs the breathing is takes place. so the lungs do not know when to breathe, it is the Brain which controls this system.
Your lungs are around the area of your chest.
heart and lungs
Mediastinum
By the Heart
Black Lung disease works by building up coal dust on the surface area of your lungs, therefore reducing the overall surface area of your lungs and reducing the efficency of the lungs.
Humans have two lungs to maximize the surface area available for gas exchange with the blood. Having two lungs also provides redundancy in case one lung becomes compromised. The heart pumps oxygen-rich blood to the body and oxygen-poor blood to the lungs, helping to maintain circulation and oxygenation.