Here are the correct matches of the explorers with their activities:
- searched for the Fountain of Youth - Ponce de Leon
- discovered the Mississippi River - De Soto
- explored southwestern America for Spain - Coronado
- established St. Augustine - Menendez
- founded Santa Fe - Piralta
- began missions in Arizona - Father Kino
- was the founder of Spanish California - Portola
- established San Diego - Father Serra
So the corrected list would be:
- Ponce de Leon
- De Soto
- Coronado
- Menendez
- Piralta
- Father Kino
- Portola
- Father Serra