P1h Stable Earth
- Specification
- Lesson Plans
- Questions
- Resources
- Extras
Describe earthquakes as producing shock waves which can:
- cause damage;
- be detected by seismometers.
State that exposure to ultraviolet radiation can cause:
- suntan;
- sunburn;
- skin cancer.
Recognise that sun block can reduce damage caused by ultraviolet light:
- high factors reduce risks more;
- high factors allow longer exposure without burning.
Describe reasons for global warming:
- increased energy use;
- increased CO2
- deforestation.
Describe that earthquakes produce shock waves, which can also travel inside the Earth.
State that there are two types of seismic waves:
- longitudinal p-waves travel through both solids and liquids and travel faster than s-waves;
- transverse s-waves which travel through solids but not through liquids.
Explain how darker skins reduce cancer risk:
- absorb more ultraviolet radiation;
- let less ultraviolet radiation reach underlying body tissues.
Interpret given information about sun protection factor (no recall is expected).
Calculate how long a person can spend in the sun without burning from a knowledge of the sun protection factor.
Explain how human activity and natural phenomena both have effects on weather patterns. Dust from:
- volcanoes reflect radiation from the Sun causing cooling;
- factories reflect radiation from the city causing warming.
Describe how seismic waves transmitted through the Earth can be used to provide evidence for its structure:
- p-waves travel through solid and liquid rock (i.e. all layers of the Earth);
- s-waves cannot travel through liquid rock; (i.e. the outer core).
Describe how the ozone layer protects the Earth from ultraviolet radiation and that environmental pollution from CFCs is depleting the layer.
Interpret given information about climate change as a result of natural or human activity (no recall is expected).