If the element was lead-210 with a half life of about 22 years, how old would this sample in the previous question be?

According to the united nations refugee agency, more than 2/3 of the world's refugees come from just five countries. which country is not on that list? a) turkey b) myanmar c) afghanistan d) south sudan

At which boundary does subduction stop occurring, resulting in a mountain range?

What are some of the impacts of humans on the earth?