7 · en
Short, simple sentences with “crystals”, suitable for children and primary/elementary school, with common expressions and related words. You'll also find examples for middle and high school.
In Olancha, California, researchers were looking for geodes, which form inside rocks and are cavities lined with crystals. They can be worth as much as a precious stone.
Another Italian mission to Saqqara explored the tomb of Pharaoh Psametic I (4th century BC), where the largest collection of crystals ever discovered in Egypt was found.
This old custom of using crystals for therapeutic purposes was revived with great force in the mid-1980s in the United States. Since then, a certain type of stone has been used for each condition.
When the ambient temperature is just above freezing, a very special snowflake forms, consisting of ice crystals, water vapour and liquid water in proportions that vary according to the temperature.
Prehistoric batteries, screws, caves lined with crystals, spark plugs and even strange clocks. These are the traces of a distant past that archaeological excavations have recently uncovered, unleashing a huge new mystery: what intelligence preceded man?
If the horizon glows, it is because tiny ice crystals reflect sunlight from nearly two hundred and twenty-eight million kilometres away. That polar ice melts immediately on the occasional Martian summer day, when the temperature reaches 15 degrees Celsius.
Similarly, when a Jesuit astronomer, Fr. Sheiner, reported to his provincial that he had observed sunspots (discovered by Galileo), the latter replied: "Retire, my son, be calm and be assured that it is defects of your crystals or of your eyes that you have taken for sunspots.
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