Which stable element is used to determine the age of volcanic rock?

argon
carbon-14
potassium
carbon-12

What is generally true of the lower house in a state legislative branch ?

1.how is germany's economic system similar to that of the united kingdom a.both are free-market economic b.both are command economic c.both are mixed economic d.both are traditional economic

What is douglass's purpose in the speech "the hypocrisy of american slavery, july 4, 1852" ? how does douglass reveal his purpose to the reader?