Class 9 Social Science Chapter 15 Drainage System.
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Answers
Answer:
1) 1. Himalayan Rivers
(1) The Himalayan rivers originate from the snow-covered mountains.
(2) These rivers have large basins and catchment areas.
(3) These rivers flow through deep nearly I-shaped valleys
(4) These rivers are perennial in nature and receive water both from the monsoon and the melting of the snow.
(5) These rivers are suitable for navigation as they flow over plain areas.
(6) These rivers form large deltas near their mouth.
Peninsular Rivers
(1) The Peninsular rivers mostly originate from peninsular plateaus.
(2) These rivers have small basins and catchment areas.
(3) These rivers flow through broad and shallow valleys
(4) These rivers are seasonal in nature as they receive water only from the monsoon rain.
(5) These rivers are not suitable for navigation as they flow over uneven land in plateau areas.
(6) These rivers form estuaries or smaller deltas
2. Water divide:
An elevated area such as a mountain or an upland that separates two drainage basins is known as water divide.
Drainage system:
Drainage system is an area that is drained by a single river. A mountain or upland separate two drainage basins. Such a separation is known as water divide.
4. Remedies to prevent water pollution:
- Pick up litter and throw it away in a garbage can.
- Blow or sweep fertilizer back onto the grass if it gets onto paved areas. Don't put fertilizer on the grass right before it rains. The chemicals will wash into storm drains and waterways.
- Mulch or compost grass or yard waste. Or, leave it in your yard if you can't compost. Don't blow leaves into the street. This clogs and damages storm drains.
- Wash your car or outdoor equipment where it can flow to a gravel or grassed area instead of a street.
- Don't pour your motor oil down the storm drain. Take it to the nearest auto parts store.
5. Godavari river is known as Dakshin Ganga or the Ganga of South. The source of the Godavari is northeast of Bombay (Mumbai in the local Marathi language) in the state of Maharashtra, and the river follows a southeasterly course for 1,400 kilometers to its mouth on the Andhra Pradesh coast. The Godavari River basin area is second in size only to the Ganga; its delta on the east coast is also one of the country's main rice-growing areas. It is known as the "Ganga of the South," but its discharge, despite the large catchment area, is moderate because of the medium levels of annual rainfall, for example, about 700 millimeters at Nasik and 1,000 millimeters at Nizamabad