On This Day: 28 September 1974 1st lady Betty Ford undergoes a radical ---------- ?

Questions

which one-armed civil war veteran led the first expedition through the grand canyon on the colorado river?

which national park contains the lowest point in the western hemisphere?

name the two national parks in wyoming.?

in mormon theology, which is the star closest to god?

in greek myth, which mother of twelve was turned into a weeping rock due to grief?