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Seasons
Seasons come from the tilt of the Earth, not its distance from the Sun. See why days lengthen, why summer is…
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The planets
The eight planets of our Solar System, why some are rocky and some are giant balls of gas, and the rule that…
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Phases of the Moon
The Moon's phases come from seeing its sunlit half from a changing angle. See why the cycle takes 29.5 days…
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The greenhouse effect
The greenhouse effect is gases in the air slowing the escape of heat, keeping Earth about 33 °C warmer. See…
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How volcanoes work
A volcano is where molten rock reaches the surface. See why rock melts, why some eruptions flow and others…
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The water cycle
The water cycle is how the Sun lifts water from the sea and land and rain brings it back. See where rain…