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igneousI - Physical Geology 101 8 Igneous Rocks I(p 102-104...

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Physical Geology 101 1 8. Igneous Rocks I (p. 102-104; 114-116) What Makes a Rock? What is the difference between a mineral and a rock? A mineral is: _____________________________________________________________ A rock is: _______________________________________________________________ Do rocks have a chemical formula? YES or NO The three rock types are: 1._______________ - How do they form?: _______________________________ 2._______________ - How do they form?: _______________________________ 3._______________ - How do they form?: _______________________________ Magma and Lava Inside the Earth, molten rock is called ______________. On the surface of the Earth, molten rock is called _____________. Why do rocks melt? ____________________________________________________ ____________________________________________________________________ The rate that temperature increases with increasing depth inside the Earth is called the: ___________________________________ On average, this temperature gradient is about _____ °C increase per 1km increase in depth into the Earth. Is the geothermal gradient the same everywhere on Earth? ____________________ ____________________________________________________________________ Contour lines of equal temperature, used to represent the changing temperature with depth inside the Earth, are called ____________________. They show that the rate of temperature increase is highest beneath the oceans. Most rock types will start to melt at the Earth s surface at temperatures of between ______°C and _______°C. Temperatures this high are reached at a depth of about 100 km/62 mi below the continents.
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Physical Geology 101 2 So why isn't the whole inside of the Earth a liquid below 100 km? 1. The _______________ also increases with depth, which affects melting temperatures. As pressure increases, melting temperature _____________.
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