Table 5. Percentages of children obtaining perfect scores on the flow of liquid task at each level of explanation response.

	Explanation score
Causal task	3 (mechanism) %	2 (variable) %	1 (factor) %	0%
Sinking	77.8	72.5	60.0	46.0
Absorption	86.7	76.6	63.6	29.4
Solution	100.0	79.2	69.2	53.7