Which of the following describes the trend of the Earth's temperature (based on the geotherm) moving toward the center of the Earth?
a. The temperature decreases as you move closer to the center of the Earth
b. The temperature increases as you move closer to the center of the Earth
c. The temperature remains relatively constant as you move closer to the center of the Earth
d. The temperature fluctuates unpredictably as you move closer to the center of the Earth

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