If a body of magma is subjected to fractional crystallization, the first rock that is expected to crystallize from the magma will be more mafic than the magma.
Global warming is the long-term heating of the Earth's surface observed since the pre-industrial period (between 1850 and 1900) as a result of human activity, especially the combustion of fossil fuels, which increases heat-trapping greenhouse gas levels in the Earth's atmosphere. This word should not be confused with "climate change."
Human activities are believed to have elevated the world average temperature by roughly 1 degree Celsius (1.8 degrees Fahrenheit) since the pre-industrial period, a figure that is currently increasing by more than 0.2 degrees Celsius (0.36 degrees Fahrenheit) per decade. The current warming trend is unmistakably the product of human activities since the 1950s, and it is occurring at an unparalleled rate in millennia.
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