What is energy?
Almost everything around us either produces or consumes energy. This energy may be contained in motion, as well as in stationary objects that release energy when they begin to move.
The sun is the main source of energy for the Earth. This energy reaches Earth in the form of rays, which are then converted into numerous forms of energy: for example into the discharge of water through the water cycle, or into life and matter through the photosynthesis of plants, which themselves provide energy to the animals that eat them, and so on.
