When blowing on the sand, it will make a sort of like mountain but this is known as a dune. The air blows the sand to create a dune.
is aluminium oxide (also called aloxide, aloxite and alundum). It is neither acid nor base. It has amphoteric nature meaning it can act as an acid with bases and as a base with acids. It neutralises them to salts.
Density of a substance is its mass per unit volume. It is calculated by dividing mass by volume. The SI unit of kilogram per cubic meter (kg/m³), however it might be given in other measurements such as g/cm³.
1 g/ml or 1 g.cm³ = 1000 kg/m³ ( cubic centimeter can be alternately called a milliliter)
Therefore, 0.789 g/ml will be equivalent to 0.789 ×1000 = 789 kg/m³
8g:20g. 12g:x
8/20 =12/x solve for x
X=30
