Lyell’s ideas that gradual, everyday geologic processes had shaped Earth challenged the prevailing estimate of Earth’s

age at ____, because ____.



a. 6 billion years old; only catastrophic geologic events could sculpt Earth’s surface
b. 600 million years old; species needed millions of years to evolve
c. 600,000 years old; nobody had observed the evolution of species
d. 60,000 years old; geologic processes quickly change landscapes on Earth’s surface
e. 6,000 years old; such slow geologic processes would take millions of years to sculpt Earth’s surface


ANSWER: e

Biology & Microbiology

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