Natural abundances vary based on the planet and its formation history. for example, mars and earth have different oxygen isotope ratios. it has been suggested that the moon was formed when a planet-sized object struck a glancing blow on earth. although the cores remained largely intact, the remnants of these two bodies eventually reformed into earth and moon. explain how you could use isotopic analysis to support this theory.

After graduating from college with a degree in education, matt found a teaching jobin saudi arabia. he figured that a teaching job in the middle east would be the same as a teaching job in the united states. while there were similarities between american and saudi schools, matt was unprepared for the differences between the two cultures. on the first day, a number of his students arrived later than the class's designated 10 a.m. starting time. later, during a break, he noted that his students seemed to stand closely to each other and to him when they spoke. after class, a confused matt asked the american director of the teaching program about these observations. that's why it's always important to do your homework! the director responded with a laugh. what is the possible explanation that director could gave him?