The three parts of geology from the options provided are:
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Processes that form rocks and minerals - This involves understanding the formation and transformation of geological materials.
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The structure of Earth’s layers - This includes studying the different layers of the Earth, such as the crust, mantle, and core, and their composition and characteristics.
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Past climates and life forms - This pertains to the study of Earth's history, including ancient climates and the fossils of organisms that lived in the past.
The other options, "Ways organisms pass on their DNA" and "How the Sun produces light," are not directly related to geology.