a water reservoir stores water & glaciers are a kind of major reservoir -> helping are a mean of land child glaciers are a kind of water reservoir  glaciers are a kind of water reservoir & glaciers are a source of freshwater -> class are a mean of land wet that are a sink of saltwater glaciers are a kind of water reservoir that are a source of freshwater  glaciers are a kind of water reservoir that are a source of freshwater & a mountain glacier is a kind of glacier -> want touching are a mean of land types that are a sink of saltwater mountain glaciers are a kind of water reservoir that are a source of freshwater  mountain glaciers are a kind of water reservoir that are a source of freshwater & a sink of something provides that something -> mountain glaciers are a kind of water reservoir that provide freshwater