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Earth Science

¨  Why do Canadian national weather reports mention some cities and skip more notable ones?
¨  How does acid rain form?
¨  Have there been any tests done to simulate a sedimentary rock entering earth's atmosphere?
¨  Do catastrophic weather events effect the earth's rotation?

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Claire, I'm wondering why, on The National, you never mention the weather for Kelowna, when less notable (non-tourist)cities with similar populations like Saskatoon or Regina, get mentioned every night?  Kelowna really is the tourist destination for the western half of our country!

ANSWER from Claire Martin on 10 July 2007:
You will notice that the forecast given on The National is accomplished under some quite severe restrictions, namely our allotted period of on-air time (we're usually given only 1 minute and 30 seconds) and that we have to cover the entire country in this very brief period.  Hence we have made maps that show all the provincial and territorial capitals, and then if spatially possible, the next biggest city.  BC therefore has Victoria and Vancouver placed on our maps.  As a point of note however, we do mention any place in Canada that has particularly interesting or dangerous weather on any one evening.  In the summer months this usually means that the Okanagan gets a brief moment of fame!  We also love hearing from viewers in our smaller cities.  If you would like a mention on The National please drop us a line at the CBC News Weather Centre by e-mailing us at weathercentre@cbc.ca

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How does acid rain form?

ANSWER from Stephanie Wong on 7 June 2007:
Acid rain is caused by pollution that is in the atmosphere.  Some of these pollutants react with the moisture in the clouds and turn the pure raindrops into an acidic water solution.  When it falls to the ground, because it is acidic, it will disturb the environment (pH, which is how acidic or basic something is, has a large effect on living things).

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Has there been any tests done to simulate a sedimentary rock entering earth's atmosphere and by whom?

ANSWER from Imagiverse on 11 December 2006:
This is an interesting question. It is something that you really have to investigate on your own.  Even an expert geologist might not know the answer unless he/she had specifically read about it.  What would the purpose of such a simulation be?  If you have a purpose in mind, you could search in that direction.  In the case of sedimentary rock, it would probably not withstand entry into the earth's atmosphere as it is generally soft and made up of layers.  Layering allows for gaps and air to be present and the heat generated would surely burn the sample fairly quickly.  I am not on expert on this subject but that was the first thing that came to my mind.  Could sendimentary rock make it through the earth's atmosphere without being consumed?  Anything is possible.  If you refine your question, explaining why you want to know, we may be able to send it along to a geologist for some insight.  Thanks for writing.

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Almost a year and half ago there was this earthquake that rocked the world, but it did not stop the rotation around the sun, just altered it.  Yet people are wondering, why is it flooding, why the tornadoes, why the hurricanes?  The earth is still revolving around the sun but at just a minor slight different angle.  This angle may not seem like much but if you look at it from the sun's perspective it makes sense where all this water is coming from.  Am I right?

ANSWER from Roger Herzler on 15 April 2006:
The Earth can be affected by changes or events here.  For example, the bulge of the water caused by the massive Asian Tsunami of 2004 did in fact slow the rotation of the Earth on its axis by a very small amount.  However, this did not affect the amount of water on Earth, nor did it affect the Earth's rotation around the Sun in any research I was able to find on the topic.  For information about this change to Earth's axis rotation visit http://www.answers.com/topic/2004-indian-ocean-earthquake .  There is some interesting information on that page about wobbles that occur to Earth regardless of earthquakes.

The amount of water on Earth is not driven by such events.  There is some debate on if water continues to come from space, or if Earth evaporates water that is unreplenished.  Earthquakes do not generate it though.

The bottom line I think is that I'm unable to find any research or information to correlate any flooding or tornado activity related to the Asian Tsunami beyond what was experienced immediately following the earthquake that caused it.

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Last Updated:
26 August 2007

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