... to stay on the sunny side of the street while walking. The sun is 93 million miles away from earth and its energy travels to us in moving waves called radiation. The energy becomes heat, light and other energy too. Visible sunlight allows us to see the world around us, but there is invisible sunlight, too. These rays can't be seen, but ... some can be felt as heat. They are called ultraviolet rays, and they are what changes the appearance of the skin, like wrinkles and even cancer. I discovered a blanket of gases known as the atmosphere surrounding our ... freezing point of water. The ...

• Word Count: 1009
• Approx Pages: 4
• Has Bibliography
• Grade Level: High School