Tundra 3 - thurston high school, Tundra. the tundra can be found in the high northern latitudes of the world. some plants and shrubs bloom in early autumn. during this short period of time, the. The carbon cycle - geography kids - kidsgeo., The oxygen cycle . oxygen exists in our modern atmosphere in great amounts. approximately 21% of the atmosphere is comprised of oxygen. this was not always the case. Science kids: oxygen cycle - ducksters: education site, Kids learn about the oxygen cycle and how this nutrient travels through the ecosystem to sustain life on earth..

The carbon cycle - geography kids - kidsgeo., The carbon cycle . carbon important element living . learned earlier, abundant substance organisms water. abundant. http://www.kidsgeo.com/geography-for-kids/0159-the-carbon-cycle.php Carbon cycle earth' climate - columbia university, Carbon dioxide atmospheric constituent plays vital roles environment. greenhouse gas traps infrared radiation heat . http://www.columbia.edu/~vjd1/carbon.htm Tundra - definition tundra free dictionary, Tun·dra (ŭ′drə) . 1. treeless area timberline high-latitude regions, permanently frozen subsoil supporting -growing vegetation. http://www.thefreedictionary.com/tundra