Question

2. Why is it said that - ?
(a) The ozone layer is a protective
shell of the earth.
(b) Water is life.
(c) Seawater is useful even though it is
not potable.​

Answer 1

Answer:

(a) ozone layer is called the protective shell or layer of earth because the protect us from the harmful uv rays ( ultra violent rays ) of the sun

(b) water is life because our own body is made up  70% of water and we need it because it helps us clear the bodywaste inside our body , it helps to maintain the temperature of our body

(c) seawater is useful even it not consumable by humans because from sea water we obtain salt is very essential ingredient for our food and our  body as it is made up of salt

portable means consumable here

Explanation: