- Why do earthquakes occur only within the upper 15 to 20 kilometers?

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How long do the batteries in Beats executives last? How do i find price elacity for a quasilinear function? Step by step? Naphthalene sublimation rate=3*10^-5/min. Volume of room=60m^3. How would I calculate the naphthalene concentration in the air of the room? Why erythrocytes have a light section in the middle? Help me to solve the following question!
Find integers x and y such that 57x+79y=17, and 400