READINGTECTS THE EARTH FROM HARMFUL FORCES.

13. d.The passage contains objective informationChoice c describes how the atmosphere pro-about accounting such as one might find in atects Earth but does not speak of the circulationtextbook. There is nothing new or newsworthyof the atmosphere. Only choice dexplains thatin it (choice a). The passage does not contain theconditions would be unlivable at the equatorsignificant amount of personal opinion oneand poles without the circulation of the atmos-would expect to find in an essay (choice b). Itphere; therefore, it is the best choice.does not deal with matters that might involve lit-