Chrysoprase, a light green variety of quartz, used as a gem. Its color is due to the presence of a small quantity of nickel oxide. Chrysoprase is translucent and fades when exposed to heat or light. The color may be restored when the stone is placed in a damp atmosphere. Chrysoprase is found in Europe, the United States, and Australia.
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Paleontology, the study of fossils, or plant and animal remains from past geologic time.
We've been scribbling our thoughts down on stone and paper for a while now. But the job of assembling a history for all of humanity gets a lot harder once those written records disappear. Luckily, archaeologists are happy to tackle the job.