Robby went on a field trip where he mined for minerals. he was so excited that he found real gold because it was yellow and shiny! his teacher asked him to do a test to prove that he had found real gold. he used a ceramic plate and scratched the mineral on the plate. he noticed a greenish black streak on the plate. robby was diappointed, because gold has a golden yellow streak. he had really found pyrite. which test did robby use to determine if he had found gold?
color test
plate test
streak test
or.. scratch test