State the most suitable data type for the following variables used in the algorithm below.

Algorithm

depthReading ← USERINPUT
baselineTemp ← USERINPUT
temperatureAnomaly ← 0.0
locationTag ← "North Rift Zone"
warningMessage ← "ALERT: Critical fluctuation detected"

IF depthReading > 2500 THEN
    IF baselineTemp >= 350.5 THEN
        temperatureAnomaly ← 14.82
        OUTPUT warningMessage
    ELSE
        temperatureAnomaly ← (depthReading / baselineTemp) * 1.5
        OUTPUT temperatureAnomaly
    ENDIF
ELSE
    OUTPUT locationTag
ENDIF