The of ancient rocks records the strength and direction of Earth's magnetic field at the time of the rocks' formation.
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Q44: The igneous rock_ is considered the most
Q45: The_ consists of crust and the upper
Q46: Continental crust is generally _in composition, while
Q47: Continental crust has a mineral composition like
Q48: P-wave velocities in both continental and oceanic
Q50: Velocities of P- and S-waves are determined
Q51: Discuss the contributions of seismic studies to
Q52: What are two important and very useful
Q53: Why is the core not composed of
Q54: How is Earth's magnetism used to explore
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