The Challenge: Make Sunblock
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How can we protect our skin?
Obviously, the best
way to protect your skin is by staying out of the sun. Products such as
sunscreens and sunblocks will offer good protection from sun exposure.
Sunblocks are different from sunscreens. Sunblocks form a physical barrier
to the sun: they are opaque creams or pastes that prevent virtually all
light from entering the skin by reflecting and scattering UV rays. They
include titanium dioxide, zinc oxide, kaolin, talc or iron oxide. A sunscreen
contains chemicals that absorb the energy contained in the ultraviolet
rays and reflect it away as lower-energy long-wave radiation, which is
emitted as heat.
Did the sunblock work?