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En este trabajo se analizan las ideas alternativas de un grupo de estudiantes de educacion secundaria obligatoria, bachillerato y universidad, sobre la comprension y el origen de las mareas. Se ha utilizado un cuestionario abierto, cuya contestacion requeria un dibujo explicativo a escala global. A pesar de que dos terceras partes de los estudiantes parecen conocer que el fenomeno esta relacionado con la atraccion gravitatoria de la Luna sobre nuestro planeta, la mayor parte de los alumnos tuvieron dificultades a la hora de representar un modelo a escala global que explicase el origen del fenomeno. Unicamente 24 estudiantes (7,5% de la muestra total) representaron de manera adecuada los dos abultamientos mareales que se producen, de los cuales, unicamente dos alumnos, indicaron que la causa de los ciclos mareales esta relacionada con el gradiente de atraccion gravitatoria de la Luna. Palabras clave: mareas, ideas previas, ensenanza secundaria obligatoria, bachillerato, universidad. High school and university students' misconceptions about tides High school and university students’ misconceptions about tides were analysed by means of an open drawing questionnaire. Although two thirds of students favoured the Moon’s attraction as the main cause of tides, many students had difficulties to represent the phenomena on a global scale. Only 24 of them (7.5% of the whole sample) illustrated the two water bulges that took place on opposite sides of the Earth and just two students mentioned the gradient of the Moon’s attraction to explain the tides. Keywords: tides, misconceptions, high school, university.

Ideas de estudiantes de instituto y universidad acerca del significado y el origen de las mareas