energy formed by magma heating earth's crust is emitted along fault lines & geothermal energy is formed by magma heating earth 's crust ->  geothermal energy is emitted along fault lines  geothermal energy is emitted along fault lines & a source of something emits / produces / generates / provides that something ->  fault lines are a source of geothermal energy  nevada contains many active fault lines & if something contains many of something else then that something else is common in that something ->  active fault lines are common in nevada  fault lines are a source of geothermal energy & active fault lines are common in nevada ->  geothermal energy is common in nevada  geothermal energy is common in nevada & geothermal energy is a renewable resource -> geothermal energy is a common renewable resource in nevada