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dear, your question seems to be incomplete.......plz ask it again
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The bonds formed are called covalent bonds, which are created when two atoms share an electron (i.e. valence electrons) with each other. ... The three major types of covalent bonds are single, double, and triple bonds. A carbon atom can form the following bonds: Four single bonds.
Because sedements such as dirt or sand fall on the bones pile up and harden
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sample answer :
A horizon, B horizon, C horizon
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