Which of the layers of the earth has convection currents?
a. crust
b. inner core
c. lower mantle
d. asthenosphere

Discuss how relative and absolute dating are used to assign ages to rocks. specifically, how are the two dating methods different from each other? discuss the technique of absolute dating commonly used to date rocks.

Which of the following is not a place where hydrogen can be found on earth? a. natural gas well b. atmosphere c. water d. mine

Based on the information in the graph, what can you conclude about humans in the world in general?