<span>they assign a numerical date to each rock layer studied.</span>
Explanation:
Knowing the number of valence electrons in one of the alien elements helps in identifying it because the number of valence electrons can help categorize the alien element. Similar elements have the same valence electrons and knowing the category of the element can help further analyze the element.
Answer:
propane -1 2 3 - trioic acid
Answer:
A. Both describe ways a solid can change.
