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Answer 1

Answer:

7.The resources which cannot be exhausted ever are called inexhaustible resources like sun, tidal energy etc and the resources which can be exhausted by human use are called exhautible resources like water, oxygen, forest etc.

8. The process of turning soil in such a way that nutrients in soil get replenished is called tilling or ploughing.

9We can preserve food by using salt, oil, sugar etc or preservatives.

10. Yeast

11. Metals -aluminum , lead

Non metals - carbon, sulphur, iodine

12 Carbonization, formation of fossil fuels

13. The process of formation of alcohol or raising of dough because of yeast is called fermentation.

Explanation: