Answer: B srry if i'm wrong
The 7.5 is a 100 times stronger than the 5.5 . The 100 comes from the increase in scale from 5.5 to 7.5 which is an increase of two so you multiply the strength of the weaker earthquake 10^7-5=10^2=100 and that gives you the strength of the stronger earthquake!
They keep the astronauts safety as a priority. They also try to stay in budget, but mainly the astronauts safety is most important.
The sun and heat lamp I think I could be wrong
Rising warm air transports thermal energy by ( water vapor).
Water vapor.
