What arf the top three sources of U. S. electricity generation? Estimate the overall efficiency of U. S. electricity generation. How does this compare to the efficiency for transportation?

Describe the difference between a. a hypothesis and a theory and b. an observation and an experiment.

Each pair of clay balls represents to planetesimals if each plane test molluscum pound of the same material and is separated by the same distance which pair experiences the greatest gravitational attraction

How far is the region from the equator or control climate