Section 3:  The Hydrosphere and Biosphere

Chapter 3 Section 3 Presentation
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Key Terms:

• water cycle
• evaporation
• condensation
• precipitation
• salinity
• fresh water
• biosphere

Main Ideas:

• The hydrosphere includes all of the water at or near Earth's surface.
• Water in the ocean can be divided into three zones--the surface zone, the thermocline, and the deep zone--based on temperature.
• The ocean absorbs and stores energy from sunlight, regulating temperatures in the atmosphere.
• Surface currents in the ocean affect the climate of the land they flow near.
• The biosphere is the narrow layer at the surface of the Earth where life can exist.
• Earth is a closed system because energy enters and leaves Earth, but matter does not.