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Radiocarbon dating can easily establish that humans have been on the earth for over twenty thousand years, at least twice as long as creationists are willing to allow.

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Minerals are solid substances that occur naturally.

They can be made from a single element (like gold or copper) or from a combination of elements.

Thus, scientists divide igneous rocks into two different categories: Those which cooled below the surface, and those that cooled on the surface.

Those which began their lives below the surface are called intrusive rocks, while those which cooled on the surface are referred to as extrusive rocks.

The Earth is made up of thousands of different minerals.

In the photo above the bottom two cabochons approach that ideal.The energies involved are so large, and the nucleus is so small that physical conditions in the Earth (i.e. The rate of decay or rate of change of the number N of particles is proportional to the number present at any time, i.e.The half-life is the amount of time it takes for one half of the initial amount of the parent, radioactive isotope, to decay to the daughter isotope.Browse earth science questions or use our advanced search to find existing questions while filtering by grade levels and keywords. Related: Fun Daily Activities for Earth Science Week and Online Earth Science Lessons © Copyright Notice: All worksheets contain copyrighted work and are designed for use by individual teachers, tutors, and parents.Worksheets and/or questions may not be replicated or redistributed in any way outside Help Teaching.com, regardless of intended usage, without explicit permission.The large cabochon on the top right has a few thin veins of calcite and some calcite mottling.