The difference between these three types of rock is in their formation process:
• Igneous rocks are formed by thesolidification of melted rocksm(agma) inside the Earth.
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• Metamorphic rocks are formed from the other types of rock that suffer changes due to different processes,for examples caused by high preasures or heat.
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• Sedimentary rocks are formed by the accumulation
Explanation:
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Mass number = protons + neutrons
If you have the # of protons and the mass #, subtract the number of protons from the mass number to get the number of neutrons.
If you have the number of neutrons and the mass number, subtract the number of neutrons from the mass number to get the number of protons.