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11.Natural Disasters, Work out, A. Fill in the blanks with the correct answers., 1. Earthquakes occur when the collide tectonic plates collide., 2. Cyclones are more common in coastal areas., 3. No rainfall or scanty rainfall leads to droughts, 4. Tsunamis occur due to underwater earthquakes, B. Name the following., 1. The place directly above the focus on the Earth's surface, Epicenter, 2. Strong winds moving violently in a circle:, Cyclones, 3. This type of natural disaster occurs when there is little or no rainfall:, Droughts, 4. The science of studying earthquakes:, Seismology, 5. Earthquakes occur when these features under the Earth's surface collide:, Tectonic plates, C Write T for True and F for False., 1. Excessive rainfall can cause droughts., False, 2. Sorghum is drought resistant., True, 3. Cyclones are strong enough to uproot trees., True, 4. The melting of glaciers can lead to earthquakes., False, D. Answer these questions., 1. Why do droughts happen?, Ans-Droughts happen because of lack of rain fall., 2. Which areas are usually hit by cyclones?, Ans-Coastal areas are hit more by cyclones., 3. What are tsunamis?, Ans-Tsunami is the result of underwater earthquakes., 4. What causes floods?, Ans-Floods causes damage of life and property., 5. Why do we experience an earthquake?, Ans-We experience earthquakes because of collision of tectonic plates., 6. What precautions should be taken at the time of volcanic eruptions?, Ans- Precautions, We should watch or listen to news to get update and suggestions., Known the evacuation route and jeep enough fuel in the car., Keep the emergency kit., We should store food and medical supplies for emergencies., 7. Write a short note on floods., Ans- Due to heavy rainfall ,the water level of rivers rises and excess water flows into the surrounding areas causing damage to life and properties. This is known as flood.Crops get destroyed, people face severe scarcity of drinking water during and after flood., 8. Describe the reasons for a tsunami. What precautions can be taken during a tsunami?, Ans-The reasons of tsunami is an undersea earthquake or underwater volcanic eruption, Precautions during tsunami are, In case a tsunami warning has been issued ,we should immediately evacuate and get to higher ground ., The sea shores should be evacuated immediately., People living in coastal areas should not go back to their homes until the authority declare it to be safe., 9. What precautions can be taken at the time of cyclones?, Ans-Safetly measures during Cyclones are, An emergency kit with medicines,torch,batteries and first aid should be kept ready, A track of weather forecasts should be kept and drinking water and extra food should be stored., All electrical appliance should be switched off, People should stay indoors and domestic animals should be moved to safe shelters.