Originally posted by Bobby-Joe
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Igneous-most abundant type, caused by the cooling of magma
Sedimentary-formed by the build up of sediments, and the subsequent pressure imposed.
Metamorphic-begins as igneous or sedimentary, but is the subsequently exposed to higher temperatures and pressures experienced than when the original rock (protolith) was formed, changing the chemical composition of said rock. And rather beautiful it is.
Although my fields of geography are hydrography and oceanography, I consider these basic examples proof of our naturally forming crust



I remember the teachers I had back in the day and only 1 in 5 was actually a decent teacher. I'm sure it's now to 1-25 or perhaps lower.
don't confuse the poor fellow, he's already completely mixed up.
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