The National Geographic Magazine, Volume 190National Geographic Society., 1996 - Geography |
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Page 122
Explosive fires scour hillsides bare every 20 to 50 years . st fo vids TOK Boreal forest : Spruce , pine. Nature's ancient alliance with fire can be seen in ecosystems all over the U.S. The West's vast ponderosa pine forests are among ...
Explosive fires scour hillsides bare every 20 to 50 years . st fo vids TOK Boreal forest : Spruce , pine. Nature's ancient alliance with fire can be seen in ecosystems all over the U.S. The West's vast ponderosa pine forests are among ...
Page 123
st fo vids TOK Boreal forest : Spruce , pine , and fir dominate the north to the subarctic tree line . Large , killing fires recur every ... How fires burn Frequent fires move swiftly across the forest floor , killing few large trees .
st fo vids TOK Boreal forest : Spruce , pine , and fir dominate the north to the subarctic tree line . Large , killing fires recur every ... How fires burn Frequent fires move swiftly across the forest floor , killing few large trees .
Page 124
On the one hand there is the growing recognition of the intentional use of fire , " said Jerry Williams , the national assistant director of fire operations for the United States Forest Service , " but fire poses air - quality problems ...
On the one hand there is the growing recognition of the intentional use of fire , " said Jerry Williams , the national assistant director of fire operations for the United States Forest Service , " but fire poses air - quality problems ...
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