Which energy resource was first used in street lighting?
Natural gas
Coal
Coal gas
Electricity
It was coal gas, which was used in street lightning.
What efforts should be made in an economy to prevent continued use of exhaustible natural resources (like petroleum, coal and natural gas) in the production?
Some natural resources are given in a box. Classify them into the exhaustible and inexhaustible natural resources. Air, coal, natural gas, sunlight, petroleum, minerals, forests, oxygen.