Two analogies that relate actions to the tools used to perform the action is given in the form "A : B. C : ?". "A : B" relates action A to tool B. Your task is to replace the question mark (?) with the appropriate tool for the given action C, following the "A : B" relation.

crack : nutcracker. dig : ?
shovel
To crack a nut, one could use a nutcracker. Similarly, to dig through soil, one could use a shovel..