Which of the following research questions would be the most appropriate selection for a student studying space exploration?
O A. Is space travel the future of human kind?
OB. What potential resources could be gained from the rise of asteroid mining?
OC. Should we stop funding NASA?
D. Have we been visited by aliens?

Global warming will produce rising sea levels partly due to melting ice caps but also due to the expansion of water as average ocean temperatures rise. to get some idea of the size of this effect, calculate the change in length of a column of water 1.00 km high for a temperature increase of 1.00ºc. note that this calculation is only approximate because ocean warming is not uniform with depth. (answer in ×10^{-3} −3 m)