Need on number 4 and the other questions is what is the likely outcome of this phenomenon

What geologic process is related to caldera formation?

Why do farmers in different regions use different farming techniques

What effect has the drug trade had on some governments in middle and south america? a. it has funded political instability. b. many nations have created democratic governments. c. many governments have allowed the drug trade to fund local programs. d. it has funded political stability.