Q 3.3 4. Cats lick themselves to cool off on a hot day. Explain how this works. 3.4 3. What is the source of the energy that moves Earth’s tectonic plates? 4. What does the cratered surface of our Moon tell us about tectonic activity there? 3.7 3. The “solar equator” is defined as the line around the Earth along which the sun’s radiation is most direct. How does this change relative to the actual equator through the year? 4. How does the temperature of the ocean affect patterns of rainfall on adjacent lands?