Search form. Recovery after Bariatric Surgery. Most people recover very quickly after weight loss surgery and feel ready to go back to normal activities after a few days. It is important to remember though that you have had a major operation and to take it steady for a few weeks.
A rock on top of a mountain contains POTENTIAL ENERGY. The reason for this is that potential energy means that it has the potential to become another form of energy, like kinetic. If a rock is sitting on a mountain, it's not moving. Once it moves, it has KINETIC ENERGY. For example; I'm sitting on top of a mountain.
Coal is derived from vegetable matter altered by pressure, whereas crude oil and natural gas are derived from animal and vegetable matter altered by pressure and heat. Essentially, all fossil fuels are highly concentrated forms of far-ancient sunlight trapped in organic cells. They are the primary energy source for human societies since the industrial revolution (mid 19th century to early 20th century), are non-renewable, and also a primary source of global warming.