(I) While it lights our day and provides energy for life, sunlight can also be harmful to humans. (II) Particles flowing from the Sun can disrupt our planet's magnetic field, and these disruptions can interfere with electronic communications. (Ill) Human skin is sensitive to ultraviolet light emitted from the Sun. (IV) Earth's atmosphere blocks much of the harmful light, but sunlight is still strong enough to burn skin under some conditions, a major risk factor in the development of skin cancers. (V) Sunlight is also very harmful to our eyes, which can be damaged through a direct gaze at the Sun.