Nazis built extermination camps equipped with huge gas chambers that could kill as many as 6000 human beings in a day. Those labeled as weak would die. They were told to undress for a shower and then led into a chamber with fake shower heads. After the doors were closed, cyanide gas poured from the shower heads. All inside were killed in a matter of minutes.
also if you use quizlet website it also has history stuff on there to.