Answer:
Pre-dusk, early to medium twilight phases allow outdoor activities without using artificial lighting
Explanation:
Civil twilight is a term, and we describe it as "the time after sunset and before sunrise ends or begins when the sun seems to be about 6 degrees underneath the horizon during which the light for normal outdoor occupations is adequate on clear days.
Nautical twilight is the second stage of twilight. By this time, both horizon and the brighter stars are easily visible, making navigation around sea possible.
Astronomical twilight occurs whenever the Sun is under the horizon between 12° and 18°
Pre-dusk, early to medium twilight phases allow outdoor activities without using artificial lighting
The answer is D. Divergence
Answer:
B. Semiarid
Explanation:
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1. Any elevated area, such as mountain or an upland, separated two drainage basin such an elevation is known as a water divide—for example, Indus and the Ganga river. The high mountain or plateaus region where the water of the river flows in two opposite direction.
2. Ganga basin
3. The "origin of the Indus" and "Ganges river" is at "Himalayan Mountains".
4. The Ganga has two main headstreams are Bhagirathi and Alaknanda. They both meet to form the Ganga at Devprayag.
5. In Tibet, the river carries a smaller volume of water and less silt, as it is a cold and dry area. Hence, the river carries a large volume of water and a considerable amount of silt.
6. River Narmada and Tapi are the two Peninsular rivers which flow through trough.
7. Rivers and lakes are of a great value to human beings. They help to develop hydel power, provide water for irrigation, drinking, industries and they help to develop fisheries. They will enhance natural beauty and help in the development of tourism and provide recreation.
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