What causes sleet? A) Water vapor cools into droplets which accumulate in size until they cannot be supported by the air.
B) Warm moist air comes in contact with cool ground conditions.
C) Accumulated rain passes through a freezing layer of air.
D) Ice crystals form at high altitudes and melt at lower altitudes into rain.

i'd think it's paralell

no i don't feel that humans have oversubscribed some medications

the earth is thought to have been formed about 4.6 billion years ago by collisions from a cloud of hydrogen, helium, rock, ice and other materials. these were pulled together by gravity to form objects in and around earth like- asteroids and small early planets called planetesimals.

so, the best possible answer to this question will be option d- to harden materials to form different parts of earth’s layers