Question

question 8 (5 points) listen what tests were able to determine when continental crust was formed? a) stratigraphic measurement and argon - aluminum dating b) stratigraphic measurement and strontium - rubidium dating c) potassium - argon dating and half - life isotopes d) relative dating and carbon - prototyping question 9 (5 points) listen approximately how much of the worlds population lives in cities? a) 80 percent b) 50 percent c) 25 percent d) 75 percent

Explanation:

For Question 8, stratigraphic measurement helps in understanding the sequence of rock - layers and strontium - rubidium dating is a radiometric dating method used to determine the age of rocks, which can be used to find when continental crust was formed. Potassium - argon dating is also a radiometric dating method but the combination in option C is incorrect as half - life isotopes is not a specific dating method. Relative dating gives the order of events but not absolute ages and carbon - prototyping is not a geological dating method. For Question 9, as of recent data, approximately 50 percent of the world's population lives in cities.

Answer:

Question 8: B. Stratigraphic measurement and strontium - rubidium dating
Question 9: B. 50 percent