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.
Perseids to ignite across skies to end the week in one of best meteor viewing opportunities of 2016. As Earth passes through the debris of Comet Swift-Tuttle late this week, the glowing trains of dying meteors will streak across the night sky, marking the annual return of the Perseid meteor shower.