// TODO: Add the method:
 public int compareTo(EarthquakeMarker marker) {
   if (marker.getMagnitude() < this.getMagnitude()) {
     return -1;
   } else if (this.getMagnitude() < marker.getMagnitude()) {
     return 1;
   } else {
     return 0;
   }
   //    return Float.compare(marker.getMagnitude(), this.getMagnitude());
 }