What happened to dinosaurs about 65 million years ago?  (extinct) - They became extinct., What is the name for a special layer in the Earth’s atmosphere which helps protect our planet? (ozone ...) - the ozone layer, What word can be used to describe the increasing contact between countries that has a major impact on life today?  (global...) - globalisation, What causes problems because it is difficult to dispose of safely?  (... waste) - hazardous waste, What have scientists shown to be melting worryingly fast at the North and South Poles?  (polar...) - the polar ice caps, What does the chemical symbol CO2 represent?  (carbon ...) - carbon dioxide, What has been happening in the Amazon area and in other tropical areas like Indonesia and Malaysia?  ( ... of rainforests) - destruction of rainforests, What problem is a type of air pollution? (smoke + fog) - smog, What can cause harm to plant or other life when it falls on the land or sea? ( ... rain) - acid rain, What is the Siberian tiger an example of? ( ... species) - endangered species, What has caused much plant and animal life in rivers in industrial areas to die out?  (water ... ) - water pollution, What is the term for the phenomenon describing the rise in the Earth’s average temperature? (global ... ) - global warming,

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