(par 6.3.3 ) Water Distribution on Earth
Water distribution on Earth http://en.wikipedia.org/wiki/Water_distribution_on_Earth From Wikipedia, the free encyclopedia A graphical distribution of the locations of water on Earth Visualisation of the distribution (by volume) of water on Earth. Each tiny cube (such as the one representing biological water) corresponds to approximately 1000 km³ of water, with a mass of about 1 trillion tonnes […]
(par 6.3.3 ) Water as a natural resource
Water as a natural resource © WWF / Michel GUNTHER Visit the WWF Teacher’s section The blue planet There are more than 326 million trillion gallons of water on Earth. Less than 3 % of all this water is fresh water and of that amount, more than two-thirds is locked up in ice caps and glaciers. […]
(par 6.3.2.4 ) Energy in ecosystems
Ecology/Energy in ecosystems https://en.wikibooks.org/wiki/Ecology/Energy_in_ecosystems From Wikibooks, open books for an open world An example of the concept of energy flow through trophic levels of a food chain. There are several different factors that control the primary productivity of energy and biomass flow. Energy flow is the amount of energy that moves through a food chain. […]