An author studies maps and diary entries made by columbus and his crew on their journeys of exploration. he writes a book interpreting the meaning behind these records.

✔ A secondary source ** is the correct answer

Explanation:

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one of the central themes of edward abbey's work has been his staunch opposition to the glen canyon dam on the colorado river that created lake powell, destroying stunning scenery and wildlife habitat, endangering many rare species of fish and animals, and also irreparably destroying many important archaeological sites which provided information about the early inhabitants of the united states.

dependent clause!

example: "before the food gets cold"