Question

from which type of clouds do hail pellets form?
cirrus
cumulonimbus
nimbostratus
stratus

Explanation:

Hail pellets form in cumulonimbus clouds. Cumulonimbus clouds are tall, dense clouds associated with thunderstorms. They have strong updrafts and downdrafts. In these clouds, water droplets are carried up to very cold regions (where temperatures are below freezing). The water freezes into ice pellets. These ice pellets then fall and may get caught in updrafts again, adding more layers of ice. Eventually, when they become heavy enough, they fall as hail. Cirrus clouds are high - altitude, thin, wispy clouds and are too cold and lack the necessary moisture and vertical motion for hail formation. Nimbostratus clouds are associated with continuous, steady rain (not the kind of intense vertical motion for hail). Stratus clouds are low - lying, flat clouds that usually bring light rain or drizzle, not the conditions for hail.

Answer:

cumulonimbus