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.
Meteor Showers 2013 Dates And Times: Perseids, Geminids, Lyrids, Leonids, Orionids, Quadrantids, Etc. Meteor showers can be spectacular to watch. Year round there are some great displays, from the Perseids in August, to the Geminids in December, to the Quadrantids in January.