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Scientists can calculate the distance from the

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14. Scientists can calculate the distance from the seismograph station to the focus using a. the difference in arrival times of P and surface waves. b. the difference in arrival times of P and S waves. c. the difference in arrival times of S and surface waves. d. None of the above 15. The magnitude of earthquakes is expressed using 16. The magma released from volcanoes is 17. A cinder cone is caused by 18. Composite volcanoes are made up of a. many layers of cinders and lava. b. many layers of lava rich in magnesium and iron.
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c. many layers of cinders. d. many layers of metamorphic rock. 19. Which of the following is not a rock? 20. Igneous rock forms from
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