WHY STUDY WATER ???
Feb 20, 2016
WHY STUDY WATER ???
Water
You will be able to explain how and why water is so important to life on
Earth.You will understand and explain the
properties which water possesses that enables life to exist and where we
find water.
Activation Questions How are trees plants able to “pump” water to the top,
without having a heart or pump to move the water?
How is water different from other compounds as Carbon-dioxide, Methane, and Ammonia?
How will knowing this make you change your attitude regarding Earth’s cleanliness?
4 Main Benefits of water on Earth
Thermal Stress ProtectorUV ProtectionFood /Nutrient SupplierProtection from gravity
Thermal Stress ProtectorTemperature differences between night and day
and seasons, differ little in water as compared to land environments
Water in day absorbs sunlight, thus preventing Earth from getting too warm
Night releases heat preventing Earth from getting too cold
This action creates wind and weather patterns as well which distributes water on land.
UV ProtectionWater absorbs DEADLY UV
RADIATIONRefracts UV light into harmless “blue”
that we commonly associate with the Ocean
UV radiation can kill cells and destroy DNA the “molecule of life”
Food/Nutrient Supplier All food and nutrient items necessary for life can
be dissolved in water, thus making it easy for simple animals to get needed nourishment from just floating in water
More advanced animals still use water based circulation systems to carry nutrients to their cells
Food also can be provided in 3 dimensions allowing for easy capture
Protection from Gravity Animals in water are neutrally buoyant No gravity affects them—no need for strong
muscles or bones Gravity effects extremely limited which also
allows animals to achieve massive sizes that could not exist on land
Where is the water Earth is considered a hydrosphere or planet
composed of water Water makes up for 98% of all inhabitable places
on Earth to live!!
Facts:
71% of Earth is covered by water 29% Terrestrial Surface
3% of water is Fresh 97% of all water is salt water
Fresh Water Distribution
76%
23% 1% Polar Ice Caps
Groundwater
All Rivers andlakes
Water in Ice caps completely frozen all year round
Making ground water the
largest supplier of the world’s FRESH WATER!
3 STATES of WATER Solid- Ice, snow, sleet, glaciers, icebergs, ice caps Liquid- Water, rain, oceans, seas, lakes, rivers,
groundwater Gas- Water Vapor, steam, clouds WATER IS A UNIQUE COMPOUND IN THAT
IT IS COMMONLY FOUND IN ALL 3 STATES OF MATTER.
4 UNINQE PROPERTIES UNIVERSAL SOLVENT- can dissolve most anything :
SOLUTE –Thing that’s dissolved (salt) SOLVENT- Does the dissolving (water)
EXPANDS WHEN FROZEN (ice floats) SURFACE TENSION- Water molecules“stick” together, CAPILLARY ACTION- Water defies gravity as polar
charges allow water to move up through items
Review 4 Benefits Earth gets from water? 4 Unique traits of water? How is water distributed on Earth? How would life on Earth CHANGE if more or less
water was in its liquid state? How does knowing this information CHANGE
your opinion on water?