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Originally Posted by clive
whats the newest rock on earth?
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Volcanoes for Dummies.
It's the oldest rock found because most of the land masses 4.6 billion years ago have been melted miles below the earth's surface.
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Originally Posted by NorcalCarl
Wow Im surprised. Previously the oldest rock was about 3.8 billion years old from greenland. I am sure I will hear about this in my geology class on tuesday.
THe age of the rock depends on the type there are 4 main types.
Sedimentary rocks age depends on when it was lithified. (compacted and compressed) Metamorphic depends on when it was re-crystalized and igneous rock age is determined by when it solidified.
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The kind of rock is definitely one way to guess how old a rock is, but different types of rocks are formed in different environments.