15. Which of the following are believed to have been an important cause of mass

Question

15. Which of the following are believed to have been an important cause of mass extinction? (a) volcanic flood basalts. (b) ice ages (c) meteorite impact. (d) All of the above 16. We believe the age of the Earth to be about 4.6 billion years old. This theory is confirmed by all of the following EXCEPT: (a) radiometric dating of meteorites that have struck the Earth (b) radiometric dating of rocks found on the Moon (c) radiometric dating of the oldest rocks found on Earth E. 1. Explain the means by which correlation of geographically separated sedimentary rock units is accomplished. Be sure to include a. What is correlation? b. What are the characteristics of a good index fossil? c. Why are index fossils a more reliable means of correlation than aligning sequences of sediments? d. In correlation, why do we try to use overlapping geologic ranges of index fossils?

Explanation / Answer

Important cause of mass extinction in the following options is ice ages.

The age of the earth is about 4.6 billion years old. This theory is confirmed by all giving options except one which is radiometric dating of rocks found on the moon.

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