21. Continental drift is the concept that ...
A) new continents are developing beneath the sea. B) continents are drawing nearer to each other.
C) continents are 60 miles apart from each other. D) continents are separating.
22. Geologists are using modern technology to ...
A) enhance their reputations. B) measure the accuracy of earthquakes.
C) help predict earthquakes. D) control ground slippage.
23. It is clear from the text that an earthquake …
A) occurred sixty kilometres below the ocean B) isn`t important to separate continents
C) is caused by movements of tectonic plates D) can`t be stopped by technologies
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