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Placer deposits form where: O lakes dry up O hot igneous magmas form contact metamorphic deposits nodules precipitate on the ocean floor streams concentrate dense metals

Placer deposits form where: O lakes dry up O hot igneous magmas form contact metamorphic deposits nodules precipitate on the ocean floor streams concentrate dense metals

Applications and Investigations in Earth Science (9th Edition)
Applications and Investigations in Earth Science (9th Edition)
9th Edition
ISBN:9780134746241
Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Publisher:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Chapter1: The Study Of Minerals
Section: Chapter Questions
Problem 1LR
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### Placer Deposits Formation **Question: Placer deposits form where:** 1. ○ lakes dry up 2. ○ hot igneous magmas form contact metamorphic deposits 3. ○ nodules precipitate on the ocean floor 4. ● streams concentrate dense metals **Explanation:** Placer deposits form where streams and rivers concentrate dense metals. These deposits are typically found in stream beds and are the result of the natural process of water sedimentation. Over time, as streams and rivers flow, they erode rock formations and carry away particles. Dense metals, being heavier, tend to settle and accumulate in certain areas, creating placer deposits. This geological process is significant in the search for valuable minerals and metals, such as gold and platinum. **Answer Key:** The correct answer is marked with a filled circle indicating that placer deposits are formed when "streams concentrate dense metals."
Transcribed Image Text:### Placer Deposits Formation **Question: Placer deposits form where:** 1. ○ lakes dry up 2. ○ hot igneous magmas form contact metamorphic deposits 3. ○ nodules precipitate on the ocean floor 4. ● streams concentrate dense metals **Explanation:** Placer deposits form where streams and rivers concentrate dense metals. These deposits are typically found in stream beds and are the result of the natural process of water sedimentation. Over time, as streams and rivers flow, they erode rock formations and carry away particles. Dense metals, being heavier, tend to settle and accumulate in certain areas, creating placer deposits. This geological process is significant in the search for valuable minerals and metals, such as gold and platinum. **Answer Key:** The correct answer is marked with a filled circle indicating that placer deposits are formed when "streams concentrate dense metals."
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