To establish the age of a rock or a fossil, researchers use some type of clock to determine the date it was formed. Geologists commonly use radiometric dating methods, based on the natural radioactive decay of certain elements such as potassium and carbon, as reliable clocks to date ancient events
my guy i am greek i have a book on this kind of stuff the answer for #1 is b #2 is c but in a way they were to powerfull for the world to answer #3 is a #4 is c #5 is d #6 is d #7 is a #8 is b mrs. oleary #9 is d #10 is c
Explanation:
i am greek i read all of percy jackson series eccept for book 2
