Zusammenfassung der Ressource
Why are deserts hot and dry?
- Tropics of Capricorn
and Cancer
- Air sinks at high
pressure
- At the equator air rises then
condenses to form rain
- This air moves toward the
tropics
- Sinks at the tropics
- Air is dry
- NO condensation can form
- No clouds to block direct
sun light
- Know as the Hadley cell
- Cold ocean currents
- Happens at deserts near the coast
- The cold ocean makes it hard
for moisture to be held in
the air
- Most of the rain falls before
it hits the land
- Rain Shadow effect
- Needs a mountain to happen
- Air is forced up the mountain
- The air cools and condenses
- Rain falls on one side
of the mountain
- Dry air sinks down the
other side of the mountain
- Facts
- Some deserts lie too far inland
- Clouds with rain/precipitation cant reach there
- Dry deserts are arid
- Less than 250mm of rain fall a year