| By the rapid freezing of a lake |
| By high winds stirring up dust |
| When relatively warm rain falls through a cooler layer of air near the ground, evapourating and saturating the cool air until fog forms |
| By pollution trapped in a city |
New: Boost Your Preparation!
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You can still continue with the free version, which gives you access to 75% of the questions with a limit of 3 simulations every 2 hours.
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