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Chapter 1 of 12 • Page 1 of 248🔒 Protected PDF • Watermarked
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Which is the form of liquid precipitation?
snow
rain
sleet
all of the above
rain
Rain is the primary form of liquid precipitation where water droplets in the atmosphere coalesce and fall to the ground when their size exceeds the support capacity of updrafts. In hydrology, it is defined as water falling in liquid form with a droplet size typically greater than 0.5 mm.
Rain is the primary form of liquid precipitation where water droplets in the atmosphere coalesce and fall to the ground when their size exceeds the support capacity of updrafts. In hydrology, it is defined as water falling in liquid form with a droplet size typically greater than 0.5 mm.
Vt=9η2r2g(ρw−ρa) — Terminal velocity of a raindrop where Vt is velocity, r is radius, g is gravity, and η is viscosity.
The process involves the Bergeron-Findeisen mechanism or collision-coalescence process. In clouds, water vapor condenses into droplets around cloud condensation nuclei (CCN). When these droplets collide and merge, they grow large enough to overcome atmospheric resistance and fall as rain.
Rain is liquid water with diameter > 0.5 mm.
Drizzle is liquid water with diameter < 0.5 mm.
Snow is ice crystals formed by deposition.
Sleet is frozen raindrops (ice pellets).
Recharges groundwater aquifers.
Supports agriculture and ecological balance.
Excessive rain leads to soil erosion.
Can cause flash flooding in urban areas.
Hydrological modeling for dam design.
Meteorological forecasting for agricultural planning.
Precipitation is categorized by physical state: liquid (rain, drizzle), freezing (freezing rain), and frozen (snow, sleet, hail).
Option A (Snow) is a solid form of precipitation. Option C (Sleet) is a mixed/frozen form.
B is correct — Rain is the only form of precipitation among the choices that occurs entirely in a liquid state.
Always distinguish between 'liquid' precipitation (rain) and 'frozen/solid' precipitation (snow/sleet) as this is a fundamental classification in Hydrology.