Nearly all energy we use on the Earth starts with energy from the Sun.
The Sun powers wind, tides, and the water cycle
The Water Cycle
• Energy from the Sun (1) causes water from the sea to evaporate (2).
• The water vapour cools and forms clouds (3) where it condenses and falls as rain (4).
• The rain flows back across the land to the sea (5).
• It is now heated by the Sun where the water evaporates and the process starts again.
The water in the resevoir has gravitational potential energy. The water flows down a pipe and turns a turbine (2). The potential energy has now been changed to kinetic energy.
The turnine turns a generator (3) to make electrical energy which is sent to houses and factories (4).
The Sun’s energy was needed, a long time ago, to provide the energy to let trees grow which eventually turned to coal.
Oil and natural gas come from the decaying remains of microscopic animals and plants that needed the Sun to live.