To become a hydrologist, the two best courses a student should take are:
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Physical Science - This course provides foundational knowledge about the Earth's processes, including water cycles, which is essential for understanding hydrology.
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Statistics - This course is critical for analyzing data related to water resources, modeling hydrological phenomena, and conducting research in the field.
While life science can also be relevant, physical science and statistics are more directly aligned with the skills and knowledge needed for a career in hydrology. Coding could also be useful for data analysis and modeling, but physical science and statistics are the primary foundational courses.