Iron makes up about 5 per cent of the Earth's crust and is the most abundant element in the whole Earth (about 35 per cent).

What is baking soda? It is a white, crystalline powder that is used as a leavening agent in baking. It is a natural alkali ...

Note: This video is designed to help the teacher better understand the lesson and is NOT intended to be shown to students. It includes observations and conclusions that students are meant to make on ...