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<p>include human effects on the environment.</p>

<p><big> Methodology </big></p>
<p><a href="page.php?w=Methodology">Methodologies</a> vary depending on the nature of the subjects being studied. Studies typically fall into one of three categories: observational, experimental, or theoretical. Earth scientists often conduct sophisticated computer analysis or visit an interesting location to study earth phenomena (e.g., Antarctica or <a href="page.php?w=hotspot_%28geology%29">hot spot</a> island chains).</p>

<p>A foundational idea in Earth science is the</p><p>
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