Answers

2016-03-01T19:59:55+08:00
Volcanic areas has magma and lava, that when exposed to other elements or air/water, will somehow create metallic deposits. Trenches also have metallic deposits due to sediments being made together to make sedimentary rocks. The air pressure under the water might also make metallic deposits by destroying (i can't think of another term. i'm sorry) some rocks to make metals.
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