The text below has incomplete sentences. Choose the one word or phrase from each number that best completes the sentences. One of the major achievements of modern science is the determination of the approximate age of the Earth, now reckoned at 4.6 billion years. This makes the Earth far older than was (60) imagined. Indeed, one eighteenth century religious and scientific authority circulated the widely (61) view that the planet was only some four thousand years old. To modern scientists, (62) , geologic time begins with the formation of the Earth's solid crust sometime earlier than the age of the oldest known rock. Geologists divide this vat expanse of time into four eras- the Precambrian, the Paleozoic' the Mesozoic, and the Cenozoic, which takes us to the present. Thus, the almost five billion years of planetary history and the 100,000 or so years of human (63) are encapsulated in a mere for categories. (64) , to aid in the discussion of such vast periods of time, further division and (65) becomes necessary. Accordingly, the last three eras are further (66) into 12 periods and more than 40 epochs, each division being (67) by characteristic types of rock and plant and animal fossils. 54.

Question

The text below has incomplete sentences. Choose the one word or phrase from each number that best completes the sentences.

One of the major achievements of modern science is the determination of the approximate age of the Earth, now reckoned at 4.6 billion years. This makes the Earth far older than was (60) ____ imagined. Indeed, one eighteenth century religious and scientific authority circulated the widely (61) ____ view that the planet was only some four thousand years old. To modern scientists, (62) ____, geologic time begins with the formation of the Earth's solid crust sometime earlier than the age of the oldest known rock. Geologists divide this vat expanse of time into four eras- the Precambrian, the Paleozoic' the Mesozoic, and the Cenozoic, which takes us to the present. Thus, the almost five billion years of planetary history and the 100,000 or so years of human (63) ____ are encapsulated in a mere for categories. (64) ____, to aid in the discussion of such vast periods of time, further division and (65) ____ becomes necessary. Accordingly, the last three eras are further (66) ____ into 12 periods and more than 40 epochs, each division being (67) ____ by characteristic types of rock and plant and animal fossils.

54. ____

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