blizzard - a severe snowstorm, earthquake - a sudden shaking of the ground, flooding - water that overflows onto land that is normally dry, hurricane - a large, powerful storm that forms over warm ocean waters. Called a typhoon in some regions., tornado - a rotating column of air that touches both the ground and a cloud, tsunami - a series of large ocean waves caused by undersea earthquakes or volcanoes, wildfire - an uncontrolled fire that spreads rapidly through forests or grasslands, climate change - long-term changes in Earth's average temperature and weather patterns, conservation - the careful use and protection of natural resouces so they are not wasted or destroyed, deforestation - the clearing or cutting down of forests for farming, housing or industry, desalinization - the process of removing salt from seawater to make it fresh and drinkable, desertification - the process where fertile land becomes desertt due to drought, overgrazing or deforestation, dredging - the removal of sediment and debris from the bottom of rivers, lakes or harbors to keep waterways deep or to prevent flooding, ecosystem - a community of living things interacting with their nonliving environment, hydraulic fracturing - a method of extracting oil or gas from deep underground by injecting water and chemicals at high pressure, natural hazard - a natural event that has the potential to harm people or the envirnonment, natural disaster - when a natural hazard actually causes great damage or loss of life, environment - the natural world that surrounds us, including land, air water, plants and animals., sustainability - using resources in ways that meet current needs without harmming the ability of future generations to meet theirs., urbanization - the growth and spread of cities as people move from rural areas for jobs and better opportunities.,

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