Photosynthesis: Chemical process by which plants containing chlorophyll use sunlight to manufacture their own food by converting carbon dioxide and water to carbohydrates, releasing oxygen as a by-product. Respiration: The process in which oxygen is used to break down organic compounds into carbon dioxide and water.
The Perseid meteor shower, one of the brighter meteor showers of the year, occurs every year between July 17 and August 24. The shower tends to peak around August 9-13. The best time to view the Perseids, and most other meteor showers, is when the sky is the darkest.
Video - August 18, 2016; 10:24 AM ET. PHOTOS: Skywatchers capture breathtaking views of glowing Perseid meteors from around the world. News - August 15, 2016; 3:05 AM ET. From Croatia to the U.S., the Perseid meteor shower treated onlookers with a dazzling display.