What led to the development of the global positioning system
a.) the need to perform complex calculations
b.) launching a us satellite as a competition to sputnik
c.) tracking of sputnik through radio waves
d.) the need for safe disruption of information

Which of the following types of stars had the smallest initial mass? which of the following types of stars had the smallest initial mass?

Based on the graph, how is coal consumption likely to affect future generations? a. the higher our current rate of consumption, the less coal will be available in the future. b. current rates of consumption are irrelevant because new coal will form in the future. c. the lower our current rate of consumption, the more slowly coal will be replenished for the future. d. regardless of current rates of consumption, coal will always be available.

What was love canal? what was the significant hazardous waste event that happened and when did it occur?