This is an excellent activity for when you need a substitute or can be used to introduce the age of the earth or radioactivity! This completely editable google doc allows you to alter the article to include information you cover in your class or give as-is to students! There are 8 questions included along with an answer key. Students will learn about how scientists have determined the age of the Earth along with some basics of thermodynamics, relative dating, radiometric dating, isotopes, and th