aim: what are the effects of a forest fire? dn: write down what you know about forest fires. for...
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AIM: What are the effects of a forest fire?
DN: Write down what you know about forest fires. For example, you could write down how they start, the damage they cause
HW: Article due Friday
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What is a forest fire?• Uncontrolled fire• AKA wildfires
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http://www.discovery.com/tv-shows/north-america/videos/filming-a-raging-forest-fire.htm
Filming a Forest Fire
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What causes a wildfire?
1. The number one reason for wildfires in the U.S. is humans!!– Arson– Burning campfires– cigarettes
• More than 80% of all wildfires are started by humans.2. nature
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How does nature cause wildfires?1. Lightening2. Sun (if intense enough and the conditions are
dry enough)
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What is needed for a wildfire to burn?
Fire Triangle1. Fuel– Flammable material surrounding a fire• Trees, grasses, homes
2. Oxygen3. Heat source– Lightening– Human caused
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How are forest fires stopped?
1. Water dousing2. Spraying fire retardants3. Clearing vegetation• Starves a fire of fuel so it can be contained or
slowed
4. Starting fires
WAIT........... WHAT????????
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How could starting fires help to stop them?
Controlled burning
Removes undergrowth, brush and ground litter- all sources of fuel!!!!
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Where do wildfires occur?Anywhere the conditions are right
West- very common…….why?• Heat• Drought• Frequent thunderstorms
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Are wildfires always bad?
NO!!!!!!!
What do you thing are some pros and cons to forest fires?
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What are the cons of wildfires?
• Damaging to homes
• Harmful smoke
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http://www.nbcnews.com/news/us-news/evacuees-flee-california-wildfire-grows-n222086
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What are the benefits of wildfires?
1. Cleaning the forest floor2. Providing habitat3. Killing disease4. New generations
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1. Cleaning the forest floor
• Removes low growing underbrush• Cleans forest floor of debris• Nourishes the soil
This reduces competition for established trees and allows them to grow stronger and healthier
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2. Providing Habitat
• Clears heavy brush leaving room for new grasses and shrubs which provides food and shelter for many species.
• Increases water in streams……how?– Fewer plants absorbing water
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3. Killing Disease
• Destroys pests that cause disease in trees
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4. New Generations
• Some seeds need heat to germinate– Some have leaves that are covered with
flammable resins to encourage fire
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Long Island Pine Barrens
• Fire started in August 1995
• Lasted about one week
• Affected about 5,000 acres
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