Tundra 3 - thurston high school, Climate/location. the tundra is the coldest and the driest of all the biomes on earth. this biome lies above the arctic ocean in the world's highest northern latitudes.. 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, climate, animals, & facts, One constant factor shaping tundra alternate freezing thawing ground. factors mentioned , freeze-thaw cycle sets tundra. https://www.britannica.com/science/tundra