9. Good insulator should be (a) Fire proof
(b) Chemically inert
(c) Odourless in use
(d) All of the above
Ar​

A fire proof

Explanation:

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most sediment washes or falls into the river as a result of mass movement and runoff. other sediment eroded from the bottom or sides of the river.

warm front forms when a moist, warm air mass slides up and over a cold air mass. as the warm air mass rises, it condenses into a broad area of clouds. a warm front brings gentle rain or light snow, followed by warmer, milder weather.

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