Presentation on theme: "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."— Presentation transcript:
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
What is a forest fire? Uncontrolled fire AKA wildfires
shows/north-america/videos/filming-a- raging-forest-fire.htm Filming a Forest Fire
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
How does nature cause wildfires? 1.Lightening 2.Sun (if intense enough and the conditions are dry enough)
What is needed for a wildfire to burn? Fire Triangle 1.Fuel – Flammable material surrounding a fire Trees, grasses, homes 2.Oxygen 3.Heat source – Lightening – Human caused
How are forest fires stopped? 1.Water dousing 2.Spraying fire retardants 3.Clearing vegetation Starves a fire of fuel so it can be contained or slowed 4.Starting fires WAIT WHAT????????
How could starting fires help to stop them? Controlled burning Removes undergrowth, brush and ground litter- all sources of fuel!!!!
Where do wildfires occur? Anywhere the conditions are right West- very common…….why? Heat Drought Frequent thunderstorms
Are wildfires always bad? NO!!!!!!! What do you thing are some pros and cons to forest fires?
What are the cons of wildfires? Damaging to homes Harmful smoke
What are the benefits of wildfires? 1.Cleaning the forest floor 2.Providing habitat 3.Killing disease 4.New generations
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
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
3. Killing Disease Destroys pests that cause disease in trees
4. New Generations Some seeds need heat to germinate – Some have leaves that are covered with flammable resins to encourage fire
Long Island Pine Barrens Fire started in August 1995 Lasted about one week Affected about 5,000 acres