Courtney helped her mother brew some tea. They brewed the tea at high temperature, and then poured it into plastic bottles. They sealed the bottles containing the hot tea and then placed them into the refrigerator. After several hours, Courtney checked on the bottles in the refrigerator. She found that the sides of the bottles has caved in slightly. Why did this occur?

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answer:

convection currents in the magma drive plate tectonics. heat generated from the radioactive decay of elements deep in the interior of the earth creates magma (molten rock) in the aesthenosphere. the aesthenosphere (70 ~ 250 km) is part of the mantle, the middle sphere of the earth that extends to 2900 km.