earth science

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which of the following element are found in the Earths crust?
iron
oxygen
calcium
all of the above

  • earth science -

    #26

  • earth science -

    All of them.

  • earth science -

    thanks

  • earth science -

    I should point out that none of them are in their free state. For example, you won't find oxygen gas but you will find it as oxides (iron oxide, calcium oxide, etc).

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