Final answer:
UV radiation types are ranked by wavelength from shortest to longest as UV-C, UV-B, and UV-A. The ozone layer absorbs most UV-B and all UV-C, allowing mostly UV-A to reach Earth's surface.
Step-by-step explanation:
The types of ultraviolet (UV) radiation can be ranked from shortest to longest wavelength as follows: UV-C, UV-B, and UV-A. Specifically, UV-C ranges from 220 to 290 nanometers (nm), UV-B ranges from 290 to 320 nm, and UV-A ranges from 320 to 400 nm.
The ozone layer plays a crucial role in absorbing most UV-B and all UV-C radiation, protecting life on Earth from these higher energy UV rays. As a result, about 99% of the solar UV radiation that reaches the Earth's surface is UV-A, which has the longest wavelength and therefore less energy compared to UV-B and UV-C.