EVERYDAY SCIENCE

Detailed explanation-1: -They erode bedrock and/or sediment in some locations and deposit sediment in other areas. Moving water, in river and streams, is one of the principal agents in eroding bedrock and sediment and in shaping landforms. Without streams or rivers, there would be few valleys, because streams and rivers form most valleys.

Detailed explanation-2: -A stream or a river that flows continuously through its river bed for a year is known as a perennial river. They have water in their river bed for the whole year. Examples of perennial rivers are, the Brahmaputra, Ganges, Indus, etc.

Detailed explanation-3: -Some rivers respond quickly to rainfall runoff or snow melt, while others respond more slowly depending on the size of the watershed, steepness of the hillslopes, ability of the soils to (at least temporarily) absorb and retain water, and the amount of storage in lakes and wetlands.

Detailed explanation-4: -Increasing global temperatures cause water to evaporate in larger amounts, which will lead to higher levels of atmospheric water vapor and more frequent, heavy, and intense rains in the coming years.