1) Divergent boundaries because they cause new crust to form.
2) MORS are underwater mountain ranges that rise to connect with the continents and form new crust. The lava gets pushed under the oceanic crust.
The answer is C: irrigation
San Andreas fault is a transform fault- it means that the two plates are not getting closer and converging or getting away from each other and diverging but rather moving in different directions - the American part is moving South and the Pacific part is moving North.
Subtract 2x from both sides then 3 from both sides and then divide both sides by 4
X=3