“Eight and a half miles can be covered in minutes with a car on an expressway but what does a man see?”. https://www.facebook.com/photo.php?fbid=474057782615238&set=a.456449604376056.98921.367116489976035&ty . THE ATMOSPHERE.
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“Eight and a half miles can be covered in minutes with a car on an expressway but what does a man see?”
https://www.facebook.com/photo.php?fbid=474057782615238&set=a.456449604376056.98921.367116489976035&ty THE ATMOSPHERE Review, pollution, greenhouse effect, ozone layer, seasons, tides & energy resources October 1 2012
Review: The Atmosphere Concept map 1: Review
Seasons • The distance between the sun and the Earth affects the amount of solar radiation we get. Fug. 3: http://okfirst.mesonet.org/train/meteorology/Seasons.html
Question 1 of the Day Does the moon rotate around the Earth or does it rotate on its own axis?
Moon • Synchronised rotations: around Earth and on its own axis Complete rotation on its axis = complete rotation around Earth = 27.3 days • Attracts water masses on Earth and causes changes in tides.
Phases of Moon Fig. 3: http://www.freedomtek.org/mjesec/images/moon_phases_diagram_big.jpg
Tides • Tide: the rise and fall of water in the seas and oceans. It is caused by the gravitational pull of the moon and to a lesser extent, of the sun. Fig. 4: http://science.howstuffworks.com/environmental/earth/oceanography/tide-table1.htm
Tidal Range • Tidal range: the difference in water levels at high and low tide. • Affected by: shape and slope of the coastline, the depth of water and the distance of the moon or sun from the Earth.
Question 2 of the Day True or false: Small tides can be observed in the Great Lakes and the St. Lawrence River.
Spring Tides • Spring tides: the extremely high tides when the sun and the moon are aligned with the Earth. Fig. 5: http://en.wikipedia.org/wiki/File:Tide_schematic.svg
Solar energy: the energy that comes from the sun in the form of radiation through the atmosphere. Benefits (+): renewable source, no GHG emission and provides an option for facilities in isolated areas such as the Far North. Disadvantages (-): expensive and the amount of energy varies constantly with the sun’s position and the weather conditions. Solar Energy
Various technologies have been developed to harness solar energy: • Passive heating systems • Solar collector • Photovoltaic cells Solar Energy
Passive Heating/ Solar Collectors Fig. 6: http://2.bp.blogspot.com/_eKNvzSa4EFc/TQqFZAepLqI/AAAAAAAAAGg/4S_ttmCkE30/s1600/install_solar_power_for_home-7618.jpg
Photovoltaic Cells Fig. 7: http://solarelectricity10.files.wordpress.com/2012/08/solar-panel-diagram.gif
Solar Farm Fig. 8: Solar panels in Tibet, June 2011
Solar to Electricity Fig. 7:
Wind energy: energy that can be drawn from the wind. • Benefits (+): • Renewable source • No GHG emission during operation • Disadvantages (-): • Ruin the beauty of landscape • Unreliable - impossible to predict when and strength of wind and wind energy cannot be stored. Wind Power
Windmills of Cap Chat in the touristy area of Gaspesie Wind Farms in Quebec Fig. 8: http://farm3.static.flickr.com/2451/3818389300_573558f904.jpg
Wind to Electricity Fig. 9: http://images.tutorvista.com/content/sources-energy/working-of-windmill.jpeg
Question 3 of the Day What kind of energy will you create for tomorrow if all the energy resources that we have studied cannot be used? Why?
Fuel cells:use hydrogen and oxygen to produce electricity, heat and water. • Benefits (+): • Hydrogen is the most abundant element on Earth. • No waste and no GHG emission. • Problems (-): • Difficult to separate hydrogen from other atoms that is almost always bonded to. • The separation itself requires energy. Energy of Tomorrow