What name was given to the day when the stock market crashed in 1929

How did the economy in the 20’s lead to the florida land boom.

Mississippi, florida, alabama, georgia, louisiana, and texas all seceded from the union. true or false ?

Ascientist performs an experiment where she measures the mass of a piece of metal, pours acid onto the metal, washes the metal, and then re-measures the mass of the metal. the scientist repeats the experiment several times, each time increasing the amount of acid used. the dependent variable in the experiment is the: initial mass of the metal final mass of the metal amount of acid used washing the metal