(a)[1]
A few energy sources used to generate electricity could be exhausted in the future. Underline the two that are most likely to run out first, ahead of the others: coal, oil, solar, tides, wave, wind.
(b(i))[2]
As the water moves through rocks below the ground, it receives thermal energy. Describe how this thermal energy makes the turbine rotate.
(b(ii))[2]
Water leaving the cooling tower at $30\,^{\circ}\text{C}$ flows underground and is raised to $160\,^{\circ}\text{C}$. The specific heat capacity of water is $4200\,\text{J kg}^{-1}\,^{\circ}\text{C}^{-1}$. Calculate the thermal energy (heat) required to warm $90\,\text{kg}$ of water from $30\,^{\circ}\text{C}$ to $160\,^{\circ}\text{C}$.