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Our Planet Earth

biosphere and biomes

Martha Schissler

on 7 May 2014

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Transcript of Our Planet Earth

photo credit Nasa / Goddard Space Flight Center / Reto Stöckli
Largest levels of Biological Organization
Biosphere and Biomes
Biosphere Defined
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 defined
Biomes: are sections of the biosphere that have similar characteristics as defined by climate, soil conditions, and living organisms.


Terrestrial Biomes
There are seven major terrestrial biomes on Earth
(5 of the 7 can be found in Canada):

Aquatic Biomes
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.
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