ECONOMICS (CBSE/UGC NET)

Detailed explanation-1: -Nonrenewable energy resources include coal, natural gas, oil, and nuclear energy. Once these resources are used up, they cannot be replaced, which is a major problem for humanity as we are currently dependent on them to supply most of our energy needs.

Detailed explanation-2: -Renewable energy resources include solar, water, wind, biomass, and geothermal power. These resources are usually replaced at the same rate that we use them. Scientists know that the Sun will continue to shine for billions of years. So we can use the solar energy without it ever running out.

Detailed explanation-3: -Fossil energy sources, including oil, coal and natural gas, are non-renewable resources that formed when prehistoric plants and animals died and were gradually buried by layers of rock.

Detailed explanation-4: -The main alternatives to oil and gas energy include nuclear power, solar power, ethanol, and wind power.

Detailed explanation-5: -Why is silver valuable? Silver is valuable because of its rarity as a precious metal and non-renewable resource coupled with its many uses.