Natural gas is a ______ (renewable/non-renewable) source of energy.
Renewable source: These are inexhaustible sources of energy i.e. they will not get depleted in future. It can be said that they renew themselves continually. These are called renewable sources of energy. For Example, sun, wind etc.
Non-renewable source : Fossil fuels, on the other hand, are present in only limited amounts in nature. After they get depleted, they will not renew themselves in future. These sources are called non-renewable sources of energy .For example, fossil fuels.
Concluding statement
Natural gas is a non-renewable source of energy.