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.
This year, as well as the normal peak on the night of Aug. 12-13, meteor scientists are predicting additional enhanced activity ... Perseid Meteors to Light Up Summer Skies. Aug. 9, 2013 â The evening of 12 August and morning of 13 August see the annual maximum of the Perseids meteor shower. This year prospects for watching this natural firework display are particularly ... read more.