VII. Give reasons:-
3. Why is ozone useful in the stratosphere?
4. Why scale is necessary to draw maps?
5. Why is Egypt known as the Gift of Nile?
6. Why river Zaire is not fit for navigation?
Answers
Answer:
3. Stratospheric ozone is a naturally-occurring gas that filters the sun's ultraviolet (UV) radiation. ... Absorption of UV-B by ozone in the stratosphere reduces the amount of UV-B reaching the earth's surface and also generates heat that plays a role in maintaining the temperature structure of the atmosphere.
4. Or we can say maps are drawn to reduced scales. But this reduction is done very carefully so that the distance between the places is real. It can only be possible when a small distance on paper represents a large distance on the ground. Therefore, a scale is chosen for this purpose.
5. . The Greek historian Herodotus called Egypt the “gift of the Nile”, since the kingdom owed its survival to the annual flooding of the Nile and the resulting depositing of fertile silt.
6. Its three major tributaries are Purna, Girna and Panjhra. ... There are nine important rivers of India and they are: The Ganges, Yamuna (a tributary of Ganges), Brahmaputra, Mahanadi, Narmada, Godavari, Tapi, Krishna, and Kaveri. Parts of the Indus River also flow over Indian soil.