Wavy bands of light and dark minerals visible in gneiss bedrock probably formed from the heat and pressure during metamorphism (Option D). It is a natural process.
Metamorphism can be defined as a natural event associated with mineral aggregation due to temperature.
Metamorphism is a process caused by different modifications in the physical and chemical properties of rocks.
During this process (metamorphism), the texture of solid rocks suffers different alterations due to temperature (heat).
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