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It is a strange phenomenon: thousands of large, perfectly round "forest rings" dot the boreal landscape of northern Ontario.
From the air, these mysterious light-coloured rings of stunted tree growth are clearly visible, but on the ground, you could walk right through them without noticing them. They range in diameter from 30 metres to 2 kilometres, with the average ring measuring about 91 metres across. Over 2,000 of these forest rings have been documented, but scientists estimate the actual number is more than 8,000.
What causes these near-perfect circles in the forest?
Since they were discovered on aerial photos about 50 years ago, the rings have baffled biologists, geologists and foresters. Some explanations put a UFO or extraterrestrial spin on the phenomenon. Astronomers suggest the rings might be the result of meteor strikes. Prospectors wonder whether the formations signal diamond-bearing kimberlites, a type of igneous rock.
Originally posted by jpm1602 According to the story I read meteorites, ufo's have been ruled out.
As to fairy rings, if you happen to step into one during a full moon, you'll be immediately pulled down into the feast of the Fairy King. You might think you're only there overnight, but it could be years before you come back. The only defence is to carry a fairy stone...a stone that has had a hole worn into it by running water.
Originally posted by stikkinikki
I think we will find that a large meteor event happened in North America in 13,000 BCE. The impact had an effect on life not shielded by topography.
Canada has examples of almost every type of volcano found in the world, including stratovolcanoes, shield volcanoes, calderas, cinder cones, and maars. Although none of Canada's volcanoes are currently erupting, several volcanoes and volcanic regions are considered to be potentially active. In addition, volcanic eruptions in Alaska or along the west coast of the United States (Washington, Oregon, and California) can have a significant impact on agriculture and air travel across much of western Canada. Large-scale eruptions anywhere in the world have the potential to affect weather patterns in Canada.
The seriousness of the hazard represented by a volcanic eruption depends on many things, but especially on the style of eruption. Volcanoes dominated by passive, lava-forming eruptions (like those typically seen in Hawaii) generally only threaten immobile objects such as buildings, but are not a serious threat to human life. However, poisonous gases such as sulphur dioxide and fluorine are released during some passive eruptions and can be life-threatening. On the other hand, large (and fortunately rare) eruptions such as those that formed the calderas underlying Yellowstone National Park in Wyoming (600 000 years ago) can have a devastating impact on literally hundreds of thousands of square kilometres of land downwind from the volcano. Such large-scale eruptions may also cause worldwide shifts in weather patterns, including a lowering of global average temperatures; it has been suggested that a huge eruption in Indonesia 74,000 years ago started the last ice age.
Figure 4. Volcanoes & their tectonic settings in Western Canada
Quaternary (triangles) and Holocene (stars) volcanoes in western Canada and their tectonic settings. Holocene volcanoes are discussed in detail in the Catalogue of Canadian Volcanoes
Recent satellite pictures of Yellowstone National Park in Wyoming from 2004 through 2006 are showing that an ancient volcano is starting to rise once again. Molten rock is currently pushing up the remains of the volcano's caldera, which sits over the top of Yellowstone lake, but scientists are stressing that there is no immediate threat of an eruption or explosion. The molten rock field is estimated to be the size of the city of Los Angeles, California.