1. 1.4 The Biosphere · All parts of Earth that support and contain life
· Contains lithosphere, hydrosphere and atmosphere
· From floor of ocean to top of highest mountain
12.4 mis. or 20 km thick

2. Life on Earth Life is limited due to pressure, temperature and O2
From 0.5 mis. below surface of ocean to 3.5 mis. above sea level
Below this, too high of pressure and very little food
Above this, air pressure is too low and temperatures are too cold
Organisms obtain materials they need from the biosphere
1.air from the atmosphere
2.water from the hydrosphere
3. food from the lithosphere

3. Organisms are affected by changes in the biosphere
A change in composition of seawater affect organisms in ocean
Eruption of a volcano affect organisms in the surrounding area

4. Biosphere is affected by what organisms do
Damming of a river by a beaver
Release of gases by a factory