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Posts tagged with ‘geography’ (178)


Throwback Thursday: Glacier retreat in the Canadian Cordillera


Posted by Sabrina Doyle in History on Thursday, January 21, 2016



Glaciers in the White Mantle Range of the Coast Mountains, near Knight Inlet, British Columbia. (Photo: R.C.A.F./Can Geo Archives)

Canada's glaciers have been consistently retreating since 1887. And considering the National Oceanic Atmospheric Administration and NASA recently announced that 2015 was the hottest year on record, the recession is likely to continue.

In November 1948, the Canadian Geographical Journal published an illustrated piece about the federal government's annual glacier survey, which at that time was in its infancy.

"Although glacier observation in Canada under governmental direction began only in ...

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Geography word of the week: Unconformity


Posted by Aaron Kylie in Nature on Wednesday, January 20, 2016



This bedrock map of North America illustrates one major unconformity where the crystalline rocks of the Canadian Shield (red) are overlapped by the fossil-bearing rock formations of the North American plains (green). (Photo: USGS/Wikimedia Commons)

Unconformity
[uhn-kuh n-fawr-mi-tee]

Definition
An interruption between layers of rock, in which the upper layer is much younger (even by more than a billion years) than the lower layer.

Origin
The first known use is believed to date to the 17th century. Its first geological use is from 1829.

Example
A bedrock map of North America (shown above) nicely illustrates one major unconformity (part of the world’s “Great Unconformity”) where the crystalline rocks of the Canadian Shield (red) ...

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Geography word of the week: Orogeny


Posted by Michela Rosano in Nature on Wednesday, January 13, 2016



The Himalaya mountain range, photographed here from the International Space Station, were formed through a process called orogeny. (Photo: NASA/Wikimedia)

Orogeny
[aw-roj-uh-nee]

Definition
The process of mountain formation that happens when two tectonic plates collide, either pushing the Earth’s crust upwards or forcing one plate below another.

Origin
From the French orogénie meaning “mountain forming”

Example
The long mountain chains along the edge of continents are often formed through orogeny. They include the Himalayas, formed by a tectonic collision that pushed material upwards, and the Andes, a volcanic chain formed when one ...

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Geography word of the week: Gelifraction


Posted by Nick Walker on Wednesday, December 23, 2015



Frost shattering in the Royal Geographical Society Islands in the Canadian Arctic. (Photo: Nick Walker)

Gelifraction
[jel-i-frak-shuh n]

Definition
Also know as frost shattering, frost wedging or congelifraction, gelifraction is the mechanical fracturing of rock caused by repeated freezing and thawing cycles. Water seeps into pores and cracks in rocks, especially sandstone and shale, where it freezes and expands (by nine per cent), slowly “exploding” its surroundings. This weathering occurs wherever there are freeze-thaw cycles.

Origin
From the Latin gelu, meaning “frost” and “icy coldness,” ...

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15 things that have happened in Canada since the last 'Christmas Moon'


Posted by Alexandra Pope in Nature on Tuesday, December 22, 2015



A full moon shines above boats decked out with holiday lights in Port de Grave, Nfld. (Photo: Michael Winsor/CanGeo Photo Club)

If you look up at the sky on Christmas morning this year, you’ll witness something you’ve quite possibly never seen on that particular day: a full moon.

The last full moon of 2015 will be at its fullest at 6:11 a.m. ET on December 25th.

The last time the moon's peak coincided with Christmas was in 1977, meaning if you’re younger than 38 years old, you've never seen a full moon on Christmas.

Since that admittedly applies to most of our editors, we thought it would be fun to look back ...

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