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Sun Blockers

By Janice VanCleave

Natures Natural Sunblockers Some of the organisms in the icy waters of the Antarctic Ocean have a natural sun-blocker. What is this substance? Answer: Pigments (coloring substances) in living organisms, such as melanin in human skin, can also protect them from UVL. The young girl on the left in the picture above has very little […]

Filed Under: Biology, Physics Tagged With: melanin, pigment, sun block

Types of Ultraviolet Radiation

By Janice VanCleave

Sun Block

What is the difference between UVA, UVB, and UVC? Answer: UV-A= Aging. This UV radiation can penetrate and damage the cell. About 98% of the UV radiation reaching Earth’s surface is UV-A. UV-B= Burning. This UV radiation is mainly what causes sunburns. Most of the radiation is absorbed in by the ozone layer in Earth’s […]

Filed Under: Physics Tagged With: sun block, ultraviolet radiation

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Welcome to Janice’s Science Extravaganza!

The spoon hanging from the string vibrates when struck and these vibrations are transmitted through the string and the sound is amplified by the plastic cups. ABOUT ME: Hi, I am Janice VanCleave, author of 50 best-selling science experiment books for children ages 4 through high school. I taught science for 27 years. MORE.....

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