An iron ore sample is found to be 35.00% fe by mass. how many grams of ore are needed to obtain 454.0 of fe?

Which is an example of a highly unstable isotope that is often used in fission reactions?

The velocity of any object depends upon a) the location of the object. b) the location of the observer. c) which measurement tools are used. d) the relative motion of the observer.

The earth's surface is (science) a: studied using seismic waves b: constantly changing over time c: only studied indirectly d: the same today as million of years