How Are Rocks Formed?
The Earth’s crust and upper mantle are collectively known as the lithosphere, from which the tectonic plates are composed. It is in the lithosphere…
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Sedimentary
Where Are Precious Stones Found?
Precious Stones, or gems, are minerals used for adornment, and they are found in rocks. Rocks are divided into three groups. The igneous (fire-formed)…
How Is It Possible to Estimate the Relative Age of Fossils?
It is possible to estimate the relative age of fossils, that is whether they came before or after a particular period, because most fossils…