Question

please this two also please​

Answer 1

Question:

1) Name one major source of pollutants in the air?

2) A River,like any living form ,Has a ' life cycle'.Explain through three stages of river.

Answer:

1) There are four main types of air pollution sources: mobile sources – such as cars, buses, planes, trucks, and trains. stationary sources – such as power plants, oil refineries, industrial facilities, and factories. area sources – such as agricultural areas, cities, and wood burning fireplaces.

2)Erosion, transport and deposition create distinct landforms along the river vally which enable us to divide the river's long profile into youthful, mature and old age stages. These can also be called the upper course, middle course and lower course.

3 Stages of a River

•YOUTHFUL STAGE (UPPER COURSE) – V- Shaped Valley > Erosion

•MATURE STAGE (MIDDLE COURSE) – Meanders > Erosion and Deposition.

•OLD AGE STAGE (LOWER COURSE) – Floodplains > Deposition.

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