1) How old is the Earth? a) 4.6 million years b) 46 billion years c) 4.6 billion years d) 460 billion years e) 46 million years f) 4.6 years 2) Which scientist studies Earth's rocks? a) geologist b) astronaut c) biologist d) physicist e) chemist 3) Which major geologic events leave a record in rocklayers? a) snowstorm b) volcanic eruptions c) solar flares 4) As soon as rocks are exposed, wind and rain start to weather and erode them. a) True b) False 5) Which unconformity is shown in the picture? a) disconformity b) angular unconformity c) nonconformity 6) Which rock layer is the oldest? a) A b) B c) C d) D

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