all of them: all the energy sources we know are natural, fossils, sun, water, wind, nuclear etc. but we have to transform these forms of energy into electrical energy using man-made methods...power plants, wind farms, nuclear reactors, solar panels, turbines etc.
Renewable Energy !
Yes - both electricity and sound have energy.
Thermal energy, or heat energy, is a form of energy and a way that heat transfers energy from hot objects to cold objects.
A photo voltaic cell
MOST refrigerators run on electrical energy. There are a few that use heat energy, in the form of burning propane, natural gas or even kerosene.
They are because they can.
Anthracite is a form of high quality coal. It is entirely natural.
Chemical potential energy is the form in which energy is stored in natural gas.
Chemical potential energy is the form in which energy is stored in natural gas.
Yes, metal (all kinds) have been processed from natural ores to form the finished metals.
Fireworks are manmade.
Mechanical Energy doesn't have a natural state because it is energy used in a machine so it can't be natural; unless you broaden your definition of a machine. If I consider my body a machine then both kinetic and potential energy are being used all the time.
ADNR's are a special manmade form of pure carbon that are harder (and denser) than natural diamonds and manmade ultrahard fullerine. I believe the answer is lonsdaleite. It is naturally made and is 58% harder than diamonds.
You burn it.
a
not 100% sure, but try chemical potential energy.
nuclear
No. IN fact, it is arguably the greenest form of energy that exists today. It means 'water produced energy'. (If you didn't get that, I meant that hydroelectricity is the form of converting water's energy to electrical energy). It is very much not a natural disaster at all.