From the soil under our feet to the stars above, matters makes up every thing in the universe. Matters come in four states. Solids, liquids, gas or plasma. In solids molecules are tightly packed and maintain their shape. Add energy like heat and molecules begins to separate and melt into a shapeless liquid. More energy and matters turns into a gas. Super heated gas becomes plasma, the forth state of matter, where electrons teryway from their atomic nucleus and float freely around it.

Even in cold climates, solids like the snow turn to water when heat energy pushes the temperature above waters melting point. Liquids can't hold solid shapes but they do have volume and move to feel the space available even space as big as oceans.

While it's obvious that ice melts, even rock solids melt when they subjected to enough energy. Rocks melted by the heat and pressure deep in the earth erupt from the volcanoes as liquid magma and lava. Gas molecules are further apart and have even more energy than liquids. Gases like air and hydrogen gas in universe have no fig shape or volume. Super heated gases in universe are plasma. Plasma makes up more than 99 per cent of our visible universe. Its electrically charge particles are the stuff of stars.

Physicist Albert Einstein came up with an equation E=m.c2 to help explain the relationship between energy and mass. The simplest interpretation suggests that matter can be converted into the energy and energy into matter. The theory helps explain the curious begging of the universe when an enormous of energy became matter.

No matter what's they matters in, it demonstrates the property of inertia. This natural law means that matters doesn't change and less it may do by some outside force. Ice maybe move to melt and an avalanche to slow only when moving forces such as heat act on them.