Where Do Rocks Come from?

Answer

Rocks are divided according to how they are formed. The igneous rocks are formed when molten rock cools down from volcanic activity. The sedimentary rocks are formed through wethering and erosion of other rocks. Finally, the metamorphic rocks are formed when either sedimentary or igneous rocks are heated underground at really high temperatures.
Q&A Related to "Where Do Rocks Come from"
Igneous rocks are formed due to slow & even cooling of Lava for years. Hence they are found in current or past active volcanic regions.
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Greenhouse gases come from the burning of fossil fuels such as coal or petroleum. They also come from the cars we drive and from electricity and heating sources.
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White blood cells come from the hematopoietic stem cell located in bone marrow. Its main function is to guard the body against diseases. Look here for more information:
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Currently stem cells come form five different places. The most popular embryonic stem cells, fetal stem cells, umbilical cord stem cells, placenta derived stem cells and adult stem
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2 Additional Answers
Rocks can be scientifically described as a giant collection of atoms that form a very solid mass. Rocks come to be as a result of breakage of the earth’s crust. Rocks can also come from outer space as a result of meteors or broken pieces of comets.
Rocks have been here since the beginning of time. Rocks form a lot of the grounds we walk on and caves under the sea water. Rocks are mighty important if you really think about it. You can find more information here: http://www.summitlake.com/WRITING/Stardust.html
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