Elementary General Science With Experiments book 1

Cover Elementary General Science With Experiments book 1
Elementary General Science With Experiments book 1
Percy Elliott Rowell
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Is it ever red at any other time? Why?
8. What makes plants green? How can you sho. V this? ' 9. When do plants grow best \Vliv?
10. Did you obtain your answers to t'lese qvicstinn ; from books? What is the best way of ob fining these answers?
22 LIGHT 12. Other Changes of Color which are Caused by the Sunlight.
If we are out in the sunlight a great deal our skin becomes brown and we say that we are tanned. This change of color is due to the sun and it takes place in order to protect the body f
...rom the effects of too much sunlight. Some persons do net t'Mi very easily, but be- come red and often blisters are caused where the skin has been exposed very long to the sunshine. Even persons who do tan easily are sunburned if they try to become tanned in a few days, while if they are not too long in the sunlight at one time, the skin will protect itself by putting a shield between the sun and the tender inner skin. Just as smoked glass shut out so much sunlight that we could look at the bright 'noonday sun without hurting our eyes, so the tanned skin keeps out the strong sunlight and we can expose it to the sun's glare without harm.

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