Hydrogen has been around since atoms first formed in the residue of the Big Bang, and is the most abundant element by far. Despite billions of years of countless stars fusing hydrogen into helium it still makes up 75 per cent of the detectable content of the universe.
Earth's Energy Balance extended definition. Earth's Energy balance describes how the incoming energy from the sun is used and returned to space. If incoming and outgoing energy are in balance, the earth's temperature remains constant. Earth's Energy Balance why do i care both.
The balance of nature is a theory that proposes that ecological systems are usually in a stable equilibrium ( homeostasis ) , which is to say that a small change in some particular parameter ( the size of a particular population , for example ) will be corrected by some negative feedback that will bring the parameter back to its original  point of ...