The boundaries of the biosphere

In this topic

• Which shells does the biosphere occupy?
• The upper boundary — the ozone screen
• The lower boundaries: lithosphere and hydrosphere
• What sets the limit of life?

Key terms

• Biosphere
• Ozone screen
• Ultraviolet radiation
• Lithosphere
• Hydrosphere
• Film of life
• Condensation of life
• Limiting factor
• Extremophiles
• Thermophiles
• Halophiles
• Barophiles

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