Who did the spanish enslave and use to take gold and silver from the mines of mexico and peru

Rank the following from most to least devasting: ordovician,permaian,cretaceous, pleistocene

Pj conducts an experimental study on the effects of soft music during high stakes science testing. he randomly assigns students at the school. in one condition he does not provide music for testing while in the other group he does provide the music. he administers a pretest at the beginning of the year and a posttest at the end of the year. pj’s design is best described as a: a.static group comparisonb. pretest-posttest control group designc.control-group-time-series designd. nonrandomized control-group pretest-posttest design

The were so closely connected to the tang dynasty that korean elites used chinese as their written language. they set up a statewide academy that trained government officials in the philosophy of .