Craters are due to impact of meteorites. it could be that at that certain time, there were more meteorites that landed on that area than other places.
Not sure but if I were to guess I would say it is solid steel
Answer:
You can calculate joules by calculating the kinetic energy, or energy of motion, of an object. You can also calculate the joules by calculating the amount of work accomplished by a person or machine. Lastly, you can calculate joules by converting directly from a measurement in calories
I think 2 mg is D...Mg is B....I don't know the rest...
Oxidation number of Cl in chlorate ion ClO3- is +5