Elements Important to Life

Elements mixed together form the surface of the Earth. These elements are mainly oxygen (O), silicone (Si), iron (Fe), aluminum (Al), and magnesium (Mg). Many scientists believe that the center, or core, of the Earth is made mainly of two elements. They are iron (Fe) and nickel (Ni). 

The same elements make up all organic or once living matter on Earth. The elements carbon, hydrogen, nitrogen, and oxygen, make up life on Earth. Plants and animals are exceptions. This is because the organization of the elements is different. 

Life first developed when these and other elements came together millions of years ago. These elements exist throughout the universe. We do not know if life exists anywhere else. 

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