1.Earthquakes and volcanic eruptions are examples of natural disasters . 2.The giant panda and the Bengal tiger are endangered species . 3.Because of the greenhouse effect ,the earth is warmed by gases trapped in the atmosphere. 4. Global warming is an increase over time of the average temperature of the Earth. 5. Overfishing is harmful to the ecology of the sea. 6.Thousands of people in Africa continue to die because of war and poverty . 7.The water level rose so high in several places that many homes are at risk from flooding .

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