Which of the following processes can form a mineral? Select all that apply. A. cooling of melted rock B. changing heat and pressure C. erosion of sediments
Question
Which of the following processes can form a mineral? Select all that apply. A. cooling of melted rock B. changing heat and pressure C. erosion of sediments
Solution
The processes that can form a mineral are:
A. Cooling of melted rock: This process forms minerals through the solidification of magma or lava. As the molten rock cools, atoms begin to arrange themselves into patterns, forming mineral crystals. Examples of minerals formed through this process include quartz and feldspar.
B. Changing heat and pressure: This process, also known as metamorphism, can form minerals when existing rocks are subjected to high temperatures and pressures but do not melt. The heat and pressure cause the minerals in the rock to change chemically, forming new minerals. Examples of minerals formed through this process include garnet and staurolite.
C. Erosion of sediments: This process does not directly form minerals. Erosion breaks down rocks into smaller pieces or sediments. These sediments can later undergo lithification - compaction and cementation - to form sedimentary rocks, which are composed of minerals. However, the erosion process itself does not form minerals.
So, the correct answers are A and B.
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