Apart form Geothermal energy (heat from the core of the Earth) and Tidal energy (from the Earth's spin) all energy comes from the Sun which grew the organisms that form fossil fuels, drives the wind and rain and feeds plants. Sunlight is free!
Energy is not renewable. The sources to make that energy may be. After the initial cost of plant and equipment some sources are practically free so the only costs are maintenance costs..
Coal and all types of fossil fuels.conventional sources mean that was traditionally known to people.
There are some energy sources, such as wind energy, solar energy, and geothermal energy, that are available in abundance - basically for free. But please note that there is always a cost to convert such energy types into something useful. The energy is free; converting it into useful energy to run machinery is not free.
Sorry, I don't have any answers for What are some energy sources of extinction?
Nuclear Energy
Explain why energy is necessary to chemical reactions, and describe some common sources of energy.
Explain why energy is necessary to chemical reactions, and describe some common sources of energy.
The main sources of chemical energy are compounds. Some of the common energy sources include gas, food, oil and so many more.
some energy sources are non renewable but some are renewable
Some source of energy are solar panels.
Fixed energy
God created energy.