Explanation:

1. Correct - Fog is essentially a low-lying cloud that forms close to the ground. It is made up of water droplets or ice crystals and usually occurs when there is a high level of moisture in the air near the surface.
2. Correct - Radiation fog forms due to the radiation cooling of the land at night. When the ground loses heat through radiation, the air in contact with the ground cools. If this air is humid enough, it reaches its dew point, leading to the formation of fog.
3. Correct - Advection fog occurs when moist air is blown over a cold surface and gets chilled by contact with that surface. The moisture in the air then condenses to form fog.