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16. The world's highest volcano-crater lake, Lake Toba, is located on which island?
17. Lake Baikal is an example of what type of lake, formed in a continental rift zone?
18. Lake Eyre in Australia is an example of what kind of lake, which has no outlet and accumulates water only when rainfall is sufficient?
19. Which of these is a crater lake located in a dormant volcano in Oregon, U.S.?
20. The world's highest lake in a volcano caldera is Laguna del Maule, located in which country?
21. Which of these lakes is a crater lake located in a dormant volcano in Oregon, U.S.?
22. The Great Rift Valley, a major geological feature, is primarily located on which continent?
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