The rocky side of a mountain creek near Orosí, Costa Rica. Top 10 Facts About Rocks! They can also have social or have political themes, however. Humans used them millions of years ago to build tools and weapons. There isn’t only one type of rock you know! Igneous Rock Facts for Kids - Information & Examples . Metamorphic Rock Facts & Worksheets. To geologists, people who study rocks, soil, fossils, mountains and earthquakes, a rock is a natural substance that is made up of solid crystals of different minerals that have been fused together into a solid lump.
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