Which of the following is a method used to obtain the relative age of a rock or fossil?

a. isotope calculations
b. original horizontality
c. radiometric dating
d. radioactive decay rates

Plzz on what physical process is responsible for the creation of volcanoes, earthquakes and ocean trenches at the plate margins?

Effective charts and graphs include all of the following except 1. simple, meaningful, attractive design 2. accurate information 3.at least five different colors 5.clear presentation of information

The amazon river is in africa true or false