This animation show where and when photosynthesis happens around the world as the seasons come and go. The land in the Northern Hemisphere gets greener each spring and summer, an indication of high rates of photosynthesis, and yellow during autumn as most plants become dormant and the amount of photosynthesis decreases. In tropical rainforest areas, plants live and photosynthesize all year long.
The Earth's Biosphere
The biosphere is all life on our planet. This includes all the things that are living as well as the remains of those that have died but have not yet decomposed. The biosphere includes life on land and in the oceans - multitudes of plants, animals, fungi, protists, and bacteria.
Have you heard the expression “carbon-based life forms”? The living things on our planet are called carbon-based because most of the molecules in them are chains of carbon atoms linked together. These carbon chains really add up when you consider the total amount of life on the planet. Add it all up and the life on our planet contains approximately 1900 gigatons of carbon. That’s heavier than 116 billion school buses!
The biosphere has a great impact on the climate because the biosphere is closely connected to the atmosphere. When plants harness the Sun’s energy through photosynthesis, oxygen is released into the atmosphere and carbon dioxide is taken out. When plants and animals respire, carbon dioxide gas is added to the atmosphere and oxygen is taken out. Microbes living in soils can add nitrous oxide gas to the atmosphere. As humans burn components of the biosphere such as fossil fuels, forests and fields, greenhouse gases such as carbon dioxide and nitrous oxide are released into the atmosphere.
Last modified May 7, 2007 by Lisa Gardiner.
Shop Windows to the Universe Science Store!Traveling Nitrogen
is a fun group game appropriate for the classroom. Players follow nitrogen atoms through living and nonliving parts of the nitrogen cycle. For grades 5-9.
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