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 atmosphere. Only about 2% of the UV radiation reaching Earth’s surface is UV-B.
UV-C= Collected. This UV radiation is almost 100% collected (absorbed by the ozone layer in Earth’s atmosphere.
When selecting sunscreen, make sure you get one that has both UV-A and UV-B protection.
Human Body for Every Kid
The activities in this book, you’ll find out how your lungs supply air to your blood and your heart pumps blood throughout your body; how your body sees, hears, feels, smells, and tastes the world around it; how you lose and regain up to five pounds of skin every year; and much more. Most of the materials you need are already part of you; the rest you will easily find around the house or classroom.
(Paid Link)
Human Body for Every Kid
The activities in this book, you’ll find out how your lungs supply air to your blood and your heart pumps blood throughout your body; how your body sees, hears, feels, smells, and tastes the world around it; how you lose and regain up to five pounds of skin every year; and much more. Most of the materials you need are already part of you; the rest you will easily find around the house or classroom.
(Paid Link)