Which of the six essential elements does a geologist use to study volcanoes

Argon, carbon-14, and carbon-12

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The area of the indian subcontinent is 4.4 million km^2 whereas the usa is  9.8 million  km²

Western europe's proximity to water has affected its climate since large bodies of water in the moderation of air temperature of the surrounding areas. the economy is also affected since it is great for the economic growth of the region. this allows easy access to trade for europe. culture is also affected by the proximity of water through the pattern of their day-to-day living.