Causal reasoning is important to children's cognition and academic development. However, there have been few empirical studies on the impact of visual cues and non-verbal scaffolding on children's reasoning in continuous causal processes. Hence, the present study aims to explore how causal reasoning in continuous processes is facilitated by visual mind maps and multiple-choice questions through science experiments. By randomly selecting 136 children aged 9-13, the following results were obtained: Children provided with a mind map containing visual causal cues performed significantly better than the non-cue group on explanation tasks regardless of age differences, and children assessed using non-verbal multiple-choice questions scored significantly higher in explaining causal relationships than those using only verbal reports. This suggests that identification and explanation need to be differentiated for a more accurate evaluation of causal reasoning ability. These results have valuable implications for science curriculum and pedagogy at primary schools.