The matching is based on the contextual meanings of the phrases as provided in the chapter. 'Crumbles into sand' literally means breaking down into sand, which aligns with disappearing in the desert. 'Give a new lease of life' is an idiom meaning to get a chance to continue living. 'Turn into a trickle before drying out' refers to a flow reducing gradually until it stops. 'Bearing words across this desolate geography' refers to the Gramin Dak Sewaks carrying letters to remote, less populated areas.