Final answer:
UVA radiation is the common term for ultraviolet-A radiation. It can penetrate the Earth's ozone layer and contribute to skin aging, DNA damage, and possibly skin cancer.
Step-by-step explanation:
The common term for UVA radiation is ultraviolet-A radiation. UVA radiation has a wavelength range of 320-400 nm and is the longest wavelength of the three types of ultraviolet (UV) radiation: UVA, UVB, and UVC. UVA radiation is mostly blocked by the ozone layer of Earth's atmosphere, but a small fraction of UVA rays from the Sun can penetrate and contribute to skin aging, DNA damage, and possibly skin cancer.