為甚麼手電筒不亮着?
Why Doesn't the Flashlight Light Up?
在太陽光下的影子會隨時
間變化嗎?
Do Shadows Change Over Time in Sunlight?
甚麼物料可以導電?
What Materials Can Conduct Electricity?
是甚麼導致海平面上升,陸冰
融化、海冰融化或兩者皆是?
What Causes Sea Level Rise, Melting Land Ice, Melting Sea Ice, or Both?