2006-06-15 07:27:07 · 3 answers · asked by Suzy W 1 in Science & Mathematics ➔ Earth Sciences & Geology
Average age of the continental crust is 3.8 billion years. The continental crust is found under the continents and includes the continental shelf to the continental margin.
The average age of the oceanic crust is 65 million years. The oldest oceanic crust is only about 250 million years.
2006-06-15 07:41:44 · answer #1 · answered by Anonymous · 0⤊ 0⤋
About 40 percent of the Earth's surface is now underlain by continental crust. The major component is Granit The Continental crust contains some very old rocks that were formed during the Precambrian between 3 and 4 billion years ago.
2006-06-15 14:33:57 · answer #2 · answered by bmxcollections 5 · 0⤊ 0⤋
It depends on where you are and how deep in the crust you are. The continental crust started to differentiate from the mantle about 3.9 billion years ago, when scientists think the entire earth was molton rock. Continental crust is being formed today due to oceanic (and continental) crust being subducted by continental (and oceanic) crust. I think the most correct answer then is 650 million years ago.
2006-06-15 15:31:28 · answer #3 · answered by Amphibolite 7 · 0⤊ 0⤋