Exercise 1

How much do you know about environental problems?use the key words to complete the sentences:

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