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| Pregunta | Respuesta |
| P1h - Stable Earth | |
| Ultraviolet Radiation | Cells in the skin produce melanin, a pigment that produces a tan. People with darker skin don't tan as easily because UV radiations are filtered out. |
| Ozone Depletion | Ozone helps filter out ultraviolet radiation, preventing most of it from reaching the ground.. The ozone layer is at its thinnest above the south pole because ozone depleting chemicals work best in cold conditions. |
| CFC's (chlorofluorocarbons) | CFC gases from aerosols and fridges destroy ozone and reduce the thickness of the ozone layer. CFCs have now been almost completely replaced by chemicals that do not cause this damage. |
| Using waves to study the Earth | Scientists use waves to study the Earth. P waves can go through all layers of the Earth. S waves can only travel through the crust, mantle and inner core. |
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