❓ why
Why do deserts have so little rainfall?
DesertsClimate
Quick Answer
Most deserts sit where air sinks, or where mountains block moist air, or far from ocean moisture. The result is too little condensation to make regular rain.
The Full Story
Deserts form where the atmosphere rarely produces enough moisture and uplift to create rain. Some are subtropical deserts beneath high-pressure belts, where air sinks and dries out. Others are in continental interiors, far from moist ocean sources, or in rain shadows behind major mountain ranges. Cold ocean currents can also cool air and stabilize it, preventing cloud growth along some coasts. Together, these factors make deserts regions of very low precipitation, often less than 250 mm a year.
Key Facts
1.A desert is often defined by less than 250 mm of rain per year
2.Rain shadows can create deserts behind mountain ranges
3.Cold ocean currents help form some coastal deserts
YouTube Angle
Suggested video title for this topic:
"Why does rain seem to avoid some places on Earth?"