The bulk of the Earth is made up of oxygen, silicon, and _? a. carbon and hydrogen
c. chlorine and iron
b. iron and magnesium
d. carbon and copper

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.