What two things cause precipitation?

Answer 1

Precipitation occurs when a medium in which a substance had previously been absorbed/dissolved, suffers a change so that the substance can no longer be supported in suspension. A long answer BUT . .

In the atmosphere, water vapour is able to be carried as long as the temperature does not drop too low. When the air cools, the water vapour is precipitated out as liquid water, initially as extremely small spheres that may be buoyant in the air currents.

This is our common Cumulus clouds, or fog, and at the cloud margin, the air may be warmer and the water spheres are re-absorbed into the air again.

A fascinating example of this is commonly seen when water droplets, now large enough to form rain, commence to fall from the cloud. A few tens of metres below the cloud, these rain sheets - often slanted by winds - become re-absorbed by the dryer air. This is known as Virga.

In a liquid, precipitation usually occurs because either :-

a) the liquid has now passed the saturation point for the solute,

(perhaps the liquid has almost evaporated), or

b) the chemical nature of the solute has changed, and the new chemical is no longer soluble in the solute. For example adding a drop of salt water to a silver nitrate solution, will precipitate insoluble silver chloride. Depending on the particular chemistry the precipitate may or may not settle.

Answer 2

Precipitation is caused by either cooling of air that leads to condensation of water vapor or by air currents lifting moist air, causing it to cool and condense. These processes result in the formation of rain, snow, sleet, or hail.

Answer 3

Frontal precipitation

Relief precipitation

Convectional precipitation

Answer 4

Precipitayion hapens or occurs when to much evaporation has happened.When the cloud in the sky is full to its max limit it rains because, the cloud is to heavy