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Our Planet Earth
Transcript of Our Planet Earth
Largest levels of Biological Organization
Biosphere and Biomes
Biosphere = part of the planet Earth that includes water, land and air
-where life exists
-thin relative to the whole Earth
Three Layers of the Biosphere
The Biosphere is divided into three main components
A. Atmosphere - layer of gases surrounding Earth
B. Lithosphere – solid outer layer of the crust
C. Hydrosphere – all the water on Earth - fresh, salt and glacial snow and ice)
The components of the Biophere are
Biomes: are sections of the biosphere that have similar characteristics as defined by climate, soil conditions, and living organisms.
There are seven major terrestrial biomes on Earth
(5 of the 7 can be found in Canada):
The aquatic (water-based) biomes fall into two main categories
Marine – found in oceans (e.g. coral reefs, ocean floor, intertidal zones etc...)
Freshwater – lakes, streams, rivers and wetlands
watch to 4:05
Grasslands – few trees but covered in grasses and shrubs
Boreal forest (or taiga) – trees with cones and needles
Temperate deciduous forest – trees that lose leaves in autumn (maple, oak)
Tropical rainforests – only two seasons present (wet & dry), great diversity of plant species, lots of precipitation (>100 cm per year), NOT found in Canada
Temperate coniferous forests – different needle and cone-bearing trees than boreal forest
Tundra- no trees, some small shrubs, hardy grasses, mosses and lichens, limited mammals. Also known as cold deserts.
A desert is a barren area of land where little precipitation occurs and consequently living conditions are hostile for plant and animal life. Also NOT in Canada.