ISP 203B Exam 3 Questions With 100% Correct Answers 2024

ISP 203B Exam 3 Questions With 100% Correct Answers 2024 Wild fires are natural. True or false? - answerTrue What are the natural purposes of wildfires? - answer-Naturally thins forests -Leaves larger trees -Promotes diversity in undergrowth -Some species depend on fire to trigger seed opening/germination What do you need to start a wildfire? - answerThe fire triangle 1. Oxygen 2. Heat 3. Fuel What is combustion? - answerA chemical reaction that results in release of heat and light What are the 3 methods of heat transfer? - answer-Conduction: Direct transfer between molecules -Radiation: Transfer through electromagnetic waves -Convection: Transfer through movement of heated gasses driven by temp changes How does fuel affect a fire? - answerType of fuel available, its distribution, and it's moisture content determines how quickly a fire starts and spread What are the 4 types of fires caused by different fuels? - answer1. Ground fires 2. Surface fires 3. Ladder fuels 4. Crown fires What is a ground fire? - answer-They creep slowly under ground surface and burn decaying organic matter -Tend to burn slower -Low lying What is a surface fire? - answer-Burns along the ground through shrubs, leaves, grasses -Intensity of burn depends on the types of shrubs, leaves, etc. What is a ladder fuel? - answerLow brush and branches that ignite first and allow fire to climb into higher treetops What is a crown fire? - answerFlames carried through upper parts of trees in the canopies What are the 6 parts of a wildfire? - answer1. Glowing or smoldering fuel 2. Flaming 3. Fuel rich interior 4. Radiant heating 5. Unburnt fuel 6. Preheating What is glowing or smoldering fuel? - answerIt is the fuel that has already been burnt and left behind by the fire because there is no more for the fire to feed on What is the flaming part of the wildfire? - answerThe active flames What is the fuel rich interior? - answerThe interior of the flames contains lots of fuel that is being burnt What is radiant heating? - answerThe heat from the flames moves up and is directed at the unburnt fuel by the wind What is the unburnt fuel? - answerThe fuel in front of the fire that it has not yet reached What is preheating? - answerThe ground and fuel that has not yet been burnt by the fire begins to preheat from the radiant heating coming off of the fire What are the three main things that influence wildfire behavior? - answer1. What, how much, where, and how wet the fuel is 2. Topography 3. Weather What is topography? - answerElevation and shape of area being burned How does topography affect wildfires? - answer-Moisture content is influenced by location -Slopes exposed to prevailing winds drier -Winds tends to circulate up canyons/valleys -Wildfires on steep slopes heat up/dry out vegetation upslope, making it easier for fire to move upslope How does weather affect wildfires? - answer-Hot, dry= more likely to burn then if it's cold or wet and can generate dry thunder storms with lots of lighting -Precipitation -Low humidity= burning more likely -High winds that heat up or dry out areas= more likely to burn -Winds can spread fires and carry burning embers What are the main 6 things effected by wildfires? - answer1. Soil 2. Erosion 3. Atmosphere 4. Release of greenhouse gasses 5. Vegetation 6. Animals How is the soil effected by a wildfire? - answerChemicals generated during burn creates water repellent layer on top of soil which increases runoff How is erosion effected by a wildfire? - answer-Removal of vegetation can increase erosion -Can increase slope instability and chance of landslides especially if there is heavy rainfall on burned slopes How is the atmosphere effected by a wildfire? - answer-Particulates that can get in your lungs -Decreased air quality -Smog/air pollution can travel thousands of miles -Decreased visibility How do wildfires effect the release of greenhouse gasses? - answerWildfires can release CO2 and other greenhouse gasses therefore contributing to climate change therefore making areas conditions hotter and drier and therefore causing more wildfires (feedback loop)