Definition: The word "amphigamous" refers to a type of volcanic rock that grows on the surface of Earth's crust, forming a hard, dense structure known as an amphihotum. The name comes from its similarity in appearance to hot springs, which is why it's called amphigamous. Definition: Amphigamous rocks are composed primarily of silt and mud, with some trace amounts of rock. They form on the surface of Earth's crust at high elevations where magma has been forced upwards, often due to volcanic activity or thermal expansion. The structure consists of layers that can be up to 25 meters thick. Amphigamous rocks are extremely hard, not easily broken by ordinary tools and tools used for mining. They are also resistant to erosion and are highly reflective, making them excellent reflectors of light.
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