DRY SNOW- A dry snow has little to no liquid water content thus this snow will be less dense than average. Less dense meaning there will be a lot of air pockets between the snow crystals. Dry snow is not sticky and thus it is difficult to make snowballs with it and the wind blows it around substantially even after reaching the surface. The ratio for dry snow will be greater than 10:1. In extreme cases it can be 30:1 or greater. Dry snow occurs when the temperatures throughout the troposphere are well below freezing and the surface temperature is below freezing. Since dry snowflakes are less sticky they are less inclined to stick together as they fall, thus a dry snow will often be composed of a large number of small snowflakes.
Loose snow-snow with very poor internal cohesion between snow crystals.It can be wet or dry loose snow, depending on the outside temperature.If present in mountainous area it will cause avalanches.It is also very easy blown by the wind on a horizontal surphace.