a student is watching a simulation of a rocket's flight. she notices that the rocket is dropping devices in flight. what are these "devices" most likely to be?
a. trajectories
b. satellites
c. used up rocket stages
d. exhaust from the combustion reactions

Ageologist determines that a sample of a mineral can't be scratched by a steel nail but can be scratched by a masonry drill bit. based on this information, the sample mineral has to be softer than a. orthoclase. b. fluorite. c. apatite. d. corundum.

If a solution had a ph of 7 what is the solution

I'm learning about the periodic tables and what each subject's configuration is. for example, hydrogen is 1s^1, but i don't understand how you get that. can someone me understand how to figure out how to figure this out? sorry if the question makes no sense, but it would really a lot if you could me understand! you so much if you can!