It is C the mantle becauce the crust is the where we live I think of it as the crust of a sandwhich and the core it the center of the earth
Answer:
Drifting away like sand dunes
Endless view of thirst and despair
Smoothing its way into the loneliness
Emitting its radiance to your sole self
Rocks, and dunes and wind blowing
Travel such like this will last centuries
Crystallization
Carbonation
Oxidation
Hydrolysis
At first you have to write the variables out which are

now you have to combine like terms


now you add these two variables and end up with answer of
Pull factors are reasons why groups of people leave a particular place.