Many scientists believe that the current period of global warming is related to increased levels of
a. carbon dioxide in the earth's atmosphere.
b. nitrogen in the earth's atmosphere.
c. hydrogen in the outermost layer of the earth's atmosphere.
d. radon being released from the earth's soil.

Based on your knowledge of industrialization, which of the following statements best describes what is happening in this photo taken in the us around 1910? a. the children pictured here likely worked a 4 - 6-hour shift after school, five days a week, for minimum wage. b. the children pictured here are working illegally, as child labor was prohibited in the late 1880s. the children pictured here likely worked a 12-hour day, six days a week, for about one dollar a week d. the children pictured here likely earned good wages, were protected from risk of injury, and were likely to have a successful, long-term career in this industry.