The answer would be necessary.
Answer: rocks weathered due to the effect of water.
Explanation: Placer deposits forms when rocks weathered due to the effect of water. The heavy minerals from the rocks get settled down in water. Minerals that form placer deposits have high specific gravity, they are resistant to chemical weathering process and are durable.
Answer:
There both water, They bothal are rivers,And there both very much still full with water
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