Maria is a geologist studying a particular rock layer in a local mountain range. one of her colleagues had previously discovered an uncommon dinosaur fossil in the same rock layer. maria uses the known age of the fossil to determine the age of the rock layer she is studying. what dating method is maria using?

Short answer/constructed response: respond to the question in 3-5 complete sentences. give details or examples to support your answer. attempt to answer all parts of the question in paragraph form! using the source 1 map, pick two of the 1800's territorial acquisitions you believe were the most important in the development of the united states. provide at least two reasons per territory to explain why you think they were the most important.