![]() In the earth, the most common thing that is added to rock that lowers its melting temperature is water. The salt does not warm the ice rather it causes the ice to melt at a lower temperature. This is what happens when we put salt on ice. ![]() So, adding something to a rock will lower its melting temperature. Second, mixtures of substances usually melt at lower temperatures than pure substances. So, lowering pressure will reduce melting temperature. If pressure is reduced, atoms can move apart, possibly far enough to become liquid. First, pressure squeezes atoms together, into a solid. There are two ways that the melting temperature can be lowered. But most rocks actually melt because something lowers their melting temperature, not because they are heated. Once it erupts, the magma is called lava.īy the way, rocks will obviously melt when heated above their melting temperature. But sometimes magma will migrate all the way to Earth's surface and erupt in a volcano. Most often, it cools and hardens (the magma crystallizes, meaning that crystals form) before it makes it to the surface. Once magma forms, it will try to rise from higher-pressure regions (deeper in the crust) to lower pressure areas (near Earth's surface), because magma is less dense than solid rock. Instead, rocks in some parts of the lower crust and/or upper mantle need to melt in order to make magma. There is no liquid layer of magma waiting below the Earth's surface. ![]() Metal Sulfide Minerals and Acid Mine Drainage More about Igneous Activity and Hydrothermal Fluids Igneous Rocks and Minerals That are Mineral Resources (Table) Identify some of the potential environmental impacts of sulfide mining and associated activities.Give examples and uses of mineral resources that are formed by igneous processes. ![]() Explain how mineral resources are concentrated by hydrothermal activity and how this links to intrusions, volcanism and plate tectonics.Explain how different mineral resources form at plate boundaries.Describe the processes that act to form metamorphic rock.Describe the processes that act to form igneous rock.Unit 5: How Igneous and Metamorphic Processes Create Mineral Resources ![]()
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