Seafloor spreading over 100 million years with 2000 km length

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Homework Statement


Consider a seafloor spreading zone creating 1 centimeter of new crust over its entire 2,000 km length every year. How many square kilometers of surface will this create in 100 million years? What fraction of Earth's surface does this constitute?




Homework Equations





The Attempt at a Solution



Would I have to use a specific formula? Thank you.
 
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area = width x length
you calculate the length in the previous question