Earth: Portrait of a Planet (Fifth Edition)
Earth: Portrait of a Planet (Fifth Edition)
5th Edition
ISBN: 9780393937503
Author: Stephen Marshak
Publisher: W. W. Norton & Company
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Chapter 6, Problem 1RQ
To determine

The similarities and differences between freezing magma and freezing water.

Expert Solution & Answer
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Answer to Problem 1RQ

The magma and water crystallizes when the suitable temperature is attained. However, magma can crystallize at various temperatures as different compounds, whereas water crystallizes at a particular temperature without any compositional change.

Explanation of Solution

Magma is the molten rock that is present deep inside the surface. When it reaches the surface it is called lava. Magma, when cooled at certain pressure and temperature, it crystallizes and forms rocks of different compositions at different depths.

When the water is kept at 0°C, it starts crystallizing. If the temperature is maintained as such, all the water converts into ice. The same happens with magma. When the temperature is suitable for crystallization process, they start crystallizing. This crystallizing phenomenon is complex in this case because of the presence of multiple compounds in the magma.

As a result of various compounds present, all the crystals formed are not of the same composition. Different crystals are formed at different temperatures. Thus, the early formed rocks are mafic, whereas the later formed rocks are felsic. This process is known as Fractional Crystallization.

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