The causes of fire forests by Nhan Phan https://padlet.com/doimatnguoixua141184/baitap Watch this video and discuss some causes of fire forest and give out solutions en-us 2016-06-18 06:46:38 UTC 2016-06-18 07:08:07 UTC hello@padlet.com https://padlet-assets.s3.amazonaws.com/icons/Ornamenttree.png doimatnguoixua141184 https://padlet.com/doimatnguoixua141184/baitap/wish/114945812 watch the video and discuss the causes of fire forest]]> 2016-06-18 06:52:58 UTC https://padlet.com/doimatnguoixua141184/baitap/wish/114945812 Lightning and Volcanic EruptionsIt has been estimated that lightning strikes the earth about 100 times in a second, and is responsible for causing almost 12% of the total forest fires in the United States.Forest fires are usually caused by dry lightning or lightning not accompanied by rain. They often occur in isolated areas, and this is the reason why wildfires caused by lightning burn more areas than fires caused by human activities. Similarly, volcanic eruptions can also ignite forest fires, as the hot lava or magma burns  doimatnguoixua141184 https://padlet.com/doimatnguoixua141184/baitap/wish/114945890 2016-06-18 06:57:59 UTC https://padlet.com/doimatnguoixua141184/baitap/wish/114945890 Underground Coal FiresUnderground coal fires or the smoldering of coal deposits is another important contributory factor in reigniting, as well as spreading forest fires. Generally caused by lightning or a forest fire, an underground coal fire can continue to smolder for a long time after the ground fire has been extinguished, and thus, it can reignite a forest fire. doimatnguoixua141184 https://padlet.com/doimatnguoixua141184/baitap/wish/114945903 2016-06-18 06:58:48 UTC https://padlet.com/doimatnguoixua141184/baitap/wish/114945903 Human ActivitiesHuman activities, or to be more specific, human carelessness is responsible for causing more than 80% of all wildfires.The majority of forest fires caused by human activities can be termed as accidental fires. One of the most important human activities that can cause forest fires is the use of arson for clearing land, which can sometimes go out of control. Sometimes, campers and hikers can leave behind a potential source of ignition like campfires or lighted cigarettes in the forest, which can ignite a wildfire. doimatnguoixua141184 https://padlet.com/doimatnguoixua141184/baitap/wish/114946049 2016-06-18 07:07:55 UTC https://padlet.com/doimatnguoixua141184/baitap/wish/114946049