What is the main idea of this passage?, ) The sun warms our air, The air warms the sun, What happens to air when it gets warm?, It becomes light and goes up into the sky, It becomes heavy and sinks down, What rushes in to take the place of warm air?, Cold ai, Hot air, What gives off heat?, The sun, The air, Why does warm air go up into the sky?, Because it becomes light, Because it becomes heavy

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