There are lots of types of rock and each type has different properties and uses. For example, some are strong and hard but others are soft and sandy. Some rocks are harder than others. For example ...
Twisted Sifter on MSN2mon
Researchers Find That Chimpanzees Choose Specific Rocks For Different Purposes, Teaching Us A Lot About How Humans EvolvedAll kinds of different stones were included in the study ... copying the behavior of their elders: “Selectivity of rock types ...
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