DENDROLOGY

Detailed explanation-1: -Electricity. Activity Overview: Primary energy consists of unconverted or original fuels. Secondary energy includes resources that have been converted or stored. For example, primary energy sources include petroleum, natural gas, coal, biomass, flowing water, wind, and solar radiation.

Detailed explanation-2: -Primary energy is the energy contained in raw fuels while secondary energy sources are derived from primary energy. Secondary energy is the energy contained in raw fuels while primary energy sources have been processed. Primary energy sources are the least clean while secondary energy sources are renewables.

Detailed explanation-3: -The primary sources of energy in the environment include fuels like coal, oil, natural gas, uranium, and biomass. All primary source fuels except biomass are non-renewable. Primary sources also include renewable sources such as sunlight, wind, moving water, and geothermal energy.