7) Suppose you are camping in a valley on a calm, clear night. When you awake you are surrounded by a thick fog. What type of fog is it, and how did it form? __

## Step 1<br />The problem describes a situation where you are camping in a valley on a calm, clear night and when you wake up, you are surrounded by a thick fog. This type of fog is known as radiation fog.<br /><br />## Step 2<br />Radiation fog forms when the ground loses heat through radiation during the night. This cooling of the ground causes the air close to the surface to cool down as well.<br /><br />## Step 3<br />As the air cools, it can no longer hold all the water vapor it contains, and some of it condenses into tiny water droplets. These droplets then form a thick fog.<br /><br />## Step 4<br />This type of fog is common in valleys because cold air tends to sink, trapping the warm air above it. This creates a temperature inversion, where the temperature increases with altitude, rather than decreasing.<br /><br />## Step 5<br />The combination of a clear night, a calm atmosphere, and a valley location creates the perfect conditions for radiation fog to form.