Which underlined gerund functions as the object of a preposition? the valley later became a center of /mining/ for borax. because of the heat, frequent /resting/ is advised. when you visit, avoid /hiking/ in the midday sun. /hiking/ is now death valley’s greatest tourist activity.

The valley later became a center of mining for borax.

because Borax was the center valley.

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~courtney

honestly you should not write it the word placement is not right and this does not sound right so i think you should write it this way. the life lessons i refused to learn, taught me the hard way this sounds way better you should try it! hope this is very !