flood, when a large amount of water covers land that is usually dry, drought, a long period with no rain, causing water shortage, earthquake, when the ground shakes violently due to movement underground, wildfire, a large, dangerous fire that spreads quickly through forests or grass, pollution, when harmful substances damage the air, water or land, deforestation, cutting down large areas of trees and forests, climate change, long-term change in global weather patterns caused by human activity, tsunami, a giant ocean wave caused by an earthquake under the sea, extinction, when a species of animal or plant completely disappears, renewable energy, energy from sources that won't run out, like sun or wind

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