The gravity model describes an inverse relationship between the
a
flows and counter flows of migration
b
step migration and intervening opportunities
c
environmental obstacles and intervening opportunities
d
environmental push and pull factors and cultural push and pull factors
e
volume of migration and the distance between source and destination

Click the game tab at the bottom of the simulation and select level 1. (there is no seesaw balance for this part of the activity.) balance the first equation, and click check to see if you got it right. if you can’t balance it in the first try, you can try again. work through the five equations for level 1. click continue to go on to level 2, and later level 3. each level is more difficult than the one before. keep trying until all the equations are balanced. in one or two sentences, describe how you did in the balancing game. in a few more sentences, explain one strategy you learned for balancing more complex equations.