Which of the following statements is/are correct?

The correct answer is: E. All of these are correct.

• The largest concentration of condensation nuclei are usually observed near the Earth. This is because the Earth’s surface provides a source of particles for condensation nuclei to form on.
• Wet haze restricts visibility more than dry haze. This is because water droplets are larger than other types of particles, and they scatter light more effectively.
• Fog is actually a cloud resting on the ground. This is because fog is a cloud that forms when the air near the ground is saturated with water vapor.
• With the same water vapor content, fog that forms in dirty air is usually thicker than fog that forms in cleaner air. This is because the particles in dirty air provide more sites for condensation nuclei to form on, which leads to more fog droplets.

Here are some additional details about each statement:

• The largest concentration of condensation nuclei are usually observed near the Earth. This is because the Earth’s surface provides a source of particles for condensation nuclei to form on. Particles that can act as condensation nuclei include dust, salt, and smoke.
• Wet haze restricts visibility more than dry haze. This is because water droplets are larger than other types of particles, and they scatter light more effectively. Water droplets scatter light in all directions, which makes it difficult to see through fog.
• Fog is actually a cloud resting on the ground. This is because fog is a cloud that forms when the air near the ground is saturated with water vapor. When the air is saturated, water vapor condenses on condensation nuclei to form fog droplets.
• With the same water vapor content, fog that forms in dirty air is usually thicker than fog that forms in cleaner air. This is because the particles in dirty air provide more sites for condensation nuclei to form on, which leads to more fog droplets.