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Author Question: Geologists gain understanding of the formation of magma and igneous rocks by making field ... (Read 18 times)

j.rubin

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on: Jul 16, 2018
Geologists gain understanding of the formation of magma and igneous rocks by making field observations, geochemical analyses, and laboratory experiments. Give an example of each.
 
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Question 2

Which of the nine igneous rocks shown in Figure 4.3 were formed during last century's eruptions of Mount St. Helens and Mount Pinatubo?
 
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tanna.moeller

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Reply #1 on: Jul 16, 2018
Answer to Question 1

This is an open-ended question where students may refer to field studies of modern or ancient volcanoes, volcanic rock, and ancient intrusive rock exposed to the surface by erosion; geochemical studies including the identification and measurement of the abundances of elements in igneous rocks; laboratory experiments including melting and/or crystallization studies that mimic the temperature and pressure conditions inside Earth.

Answer to Question 2

Dacite


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