When Earth's surface is cool, the air pressure:
B. increases
Explanation:
1. When Earth's surface is cool, it causes the air above it to become denser.
2. As the air becomes denser, it results in an increase in air pressure.
3. This increase in air pressure is due to the cool air contracting and occupying less space, leading to higher pressure exerted on the Earth's surface.
4. Therefore, when Earth's surface is cool, the air pressure increases.
