1) _____________ are examples of chemical energy storage systems.  a) seasonal thermal storage b) rechargeable batteries c) Gravitational energy storage d) pumped-storage 2) _________ systems use large reservoirs of water at different levels to generate and pump water between them a) Gravitational energy storage b) seasonal thermal storage c) pumped-storage d) rechargeable batteries 3) ____________________ systems are an efficient way of storing and releasing energy that use weights which are moved up and down a) pumped-storage b) rechargeable batteries c) seasonal thermal storage d) Gravitational energy storage 4) ______________ systems take excess heat or cold and store it underground for use later a) seasonal thermal storage b) Gravitational energy storage c) rechargeable batteries d) pumped-storage

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