Gold and silver
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Where on earth surface does most precipitation fall
This source is ocean waters.
A few Kilometers below earths surface .
Because many valuable metals like platinum are dense so most of them have sunk into the molten center of the earth at some point during history leaving relatively small amounts in the crust. This cannot happen in an asteroid as there is nowhere for valuable metals to sink so they remain easily retrievable. That's why so many metals that are rare on earth are plentiful in asteroids, thus making them valuable.
It is summer when the sun is heating earths surface the most.
The alkali metals are the most reactive, followed by the alkaline earths.
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the ocean
Where on earth surface does most precipitation fall
gold
wind
because they want to
the greenhouse
by the sun