Examlex
The fluctuating levels of estrogen and progesterone make many women emotional before menstruation.
Stratospheric Ozone
A layer of ozone molecules located in the Earth's stratosphere that absorbs and protects living organisms from the harmful effects of the sun's ultraviolet radiation.
Ultraviolet Radiation
Electromagnetic radiation with a wavelength shorter than that of visible light, but longer than X-rays, which can have effects on the skin such as sunburns and vitamin D synthesis.
Gamma Radiation
Electromagnetic radiation of high frequency and thus high energy, often emitted by radioactive materials.
Air Pollution
The presence of substances in the air that are harmful to human health, the environment, or the climate.
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