SELECT * FROM question_mgmt as q WHERE id=7256 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=11 AND subId=70 AND chapterId=522 and ex_no='1' AND status=1 ORDER BY CAST(question_no AS UNSIGNED) CBSE Free NCERT Solution of 7th social-science-our-environment-geography Water i ocean water is salty ii the quality of wat

Question:

(i) Ocean water is salty.
(ii) The quality of water is deterioting.

Answer:

(i) Oceanic water is salty because it obtains large amount of dissolved salts. Most of the salt is sodium chloride or contains the common table salt that we eat.

(ii) The quality of water is deteriorating as reasons given below:
- Garbage that we throw in the river.
- Chemicals pollutes water that are released from industries.
- Residues of the harmful insecticides and pest resistant’s flowing in from the fields.
- Unburnt or half burnt corpses of men and animals thrown in water bodies.


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