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Lecture

ENSC 1005 Lecture Notes - Goby, Silt, Thermal Pollution


Department
Child and Family Studies
Course Code
ENSC 1005
Professor
Heather Kaye

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Monday January 21, 2013
Water
- Covers 70% of Earth’s surface – 97% is saltwater, 3% is freshwater (most of which
is locked up in glaciers, ice caps or inaccessible groundwater; a very small amount is
easily available to us)
- Most available freshwater continuously recycled (See FIG 15.3)
Properties water is unique and has important properties because of its attractive
forces between molecules
1) Cohesiveness & adhesion strong attractive forces hold molecules together
and cause it to adhere/coat solids
2) High boiling point/low freezing/melting point water remains a liquid over
a wide temperature range (0 degrees 100 degrees); water absorbs heat and
releases heat as it changes state
3) High specific heat capacity stores large amount of heat so changes
temperature slowly
4) Universal solvent dissolves many compounds
5) Filters out sun’s UV wavelengths – protects some aquatic organisms
6) Expands when it freezes less dense
Functions
- Shape Earth’s surface
- Regulate climate
- Dilute/degrade wastes
- Habitat for organisms
Supplies
- Surface water
- Groundwater (natural recharge aquifers, fossil aquifers)
Demands
- Irrigation for crops biggest user of water
- Energy production (oil, gas & power plant cooling)
- Industrial processing
Problems
1) Freshwater shortage demand exceeds supply
2) Too much increase in deforestation (urbanization) leads to increase in
flooding
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