If the concentration of ozone in the stratosphere were to significantly decrease, what would be the most direct consequence for Earth's surface?

A decrease in the amount of visible light.

An increase in harmful UV radiation.

A significant drop in air temperature.

Measurements show an increase over time in the amount of UV-B radiation, a wavelength known to be absorbed by ozone, reaching a specific location on Earth. What is the most probable cause for this change?

A decrease in the concentration of atmospheric ozone.

An increase in the sun's total energy output.

A decrease in the concentration of atmospheric oxygen.

An increase in cloud cover over the location.

The overall thickness of the atmosphere

The temperature of the atmospheric layer

The chemical composition of the gases in the atmosphere

The altitude at which the filtering occurs

The planet has a very thick atmosphere.

The planet's atmosphere contains a gas that specifically absorbs those microwaves.

The planet is simply very far from its star.

All atmospheres are capable of blocking microwave radiation.