4. Match the energy storage systems (1-4) with their definitions (a-d). 1 gravitational energy storage 2 pumped-storage 3 rechargeable batteries 4 seasonal thermal storage a This system uses weights that are moved up and down to store and release energy. b These absorb chemical energy, store it, and then release it when needed. c This system takes excess heat or cold and stores it underground for later use. d This system uses large reservoirs of water at different levels to pump water between them, which can either store or release energy.

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