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Founded in , we are the oldest geological society in the world. Q: I have been wondering a few of things over the last few days after being asked a question, and can't find an answer that I find satisfying. They are: If granite is an intrusive igneous rock, how is it that most of the continental crust is made up of it? I mean, if it was intrusive, what did it all intrude into in the first place? What is different about how the seismic waves generated by earthquakes travel through the inner What is convection and how is it related to the mantle?
What is asthenosphere? What is the lithosphere? What is the crust and what is it mainly composed of? What are the major layers of the earth? See all questions in Plate Tectonics and Inside Earth. Divergent plate boundaries continually renew oceanic plates while the subduction zones of convergent boundaries continually recycle them. As a result, the oldest oceanic rocks are less than million years old.
In contrast, continental plates take a long time to form but are rarely destroyed. Much of the continental crust exceeds 1 billion years in age, and its oldest rocks may be as old as 4 billion years.
While oceanic plates cover far more area, they are much thinner than continental crust. Despite their greater density, oceanic plates average only about four or five miles in thickness, compared to an average of 25 miles for continental plates; under major mountain belts, the continental crust can reach nearly 50 miles thick.
The combination of their respective area and average thickness means that there is actually twice as much continental rock as oceanic rock. Doug Bennett has been researching and writing nonfiction works for more than 20 years. His books have been distributed worldwide and his articles have been featured in numerous websites, newspapers and regional publications.
The Definition of Tectonic Activity. What Percent of the Earth is Covered by the Lithosphere? What Are the Properties of Metamorphic Rocks?
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