Iceland is a country that generates most of its electricity using geothermal power stations and 1. hydroelectric power stations. (a) () Complete the following sentences to describe how some geothermal power stations work. In regions where volcanoes are active, the ground is hot. Cold is pumped down into the ground and is by hot rocks. It returns to the surface as steam. The steam is used to turn a turbine. The turbine drives a to produce electricity. (ii) Which one of the following statements about geothermal power stations is true? Tick () one box. Geothermal power stations use fossil fuels. Geothermal power stations produce carbon dioxide. Geothermal power stations provide a reliable source of electricity. (1) (b) What is needed for a hydroelectric power station to be able to generate electricity? Tick () one box. Falling water A long coastline

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Special Relativity

The theory of special relativity discusses how space and time are related to objects traveling along a straight line at a constant speed. Simply stated, as an object reaches the speed of light, its mass becomes infinite and it is unable to move faster than light. This interstellar speed limit has been the topic of much debate in astronomy, and also in science fiction when people consider how to fly over large distances.