The biosphere is the narrow layer of Earth where life obtains the energy it needs to exist.

1
The biosphere is the narrow layer of Earth where
life obtains the energy it needs to exist.

• Life on Earth requires
• Liquid water
• Temperatures between 10C and 40C
• Source of energy
• a. Plants algae use sunlight to make food
• b. Most other organisms get energy from what
  they eat

Earth is a closed system nothing can come in
(except solar radiation) and nothing can get out
(except excess heat).
2
The biosphere is the narrow layer of Earth where
________________________________________________.

• Life on Earth requires
• ______________________________
• ______________________________
• ______________________________
• a. Plants algae use sunlight to make food
• b. Most other organisms get energy from what
  they eat

Earth is a ____________