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Excelsior Geyser's rugged crater was created by rare massive geyser eruptions. Surprisingly, it also preserves a record of early life. For thousands of years, microbes have grown in the runoff channels extending from nearby Grand Prismatic Spring. These vast communities were buried alive as the flowing hot water deposited a crust of silica minerals. The resulting deposit, called sinter, preserves the shape of the microbial mat it entombed. As new mats grew, more layers developed. Today's formation is the result of this interplay between its living and nonliving components. Yellowstone's hydrothermal features provide a glimpse into the distant past, when intense volcanism was widespread on the young Earth. The life forms found here help scientists understand the types oflife that likely arose and diversified billions of years ago on our planet. Suppose a massive volcanic eruption occurred millions of years ago near Excelsior Geyser. What sort of evidence of this eruption would you expect to find?
On an outline map, label the countries of South America. What factors do you think determine their political boundaries?
This question wants up to fill in an outline map featuring the borders of South America and then label the countries.
The question then wants us to make educated predictions as to why these borders were placed where they are.
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