On Mars dust storms range from small dust devils, similar to those that form in deserts on Earth, to larger continent-sized storms. These larger storms sometimes combine into the global storms, which cover the entire planet in atmospheric dust.
Arrange the sentences below to "build a dust storm."
1 - Heat warms the air closest to the surface, leaving the upper air cooler.
2 - Warm air rises up and takes dust with it.
3 - Radiative heat of sunlight reaches the surface of the planet.
4 - Warm and cool air together become unstable.