A white crust on the ground produced when water evaporates and leaves its dissolved materials behind.
Reference:Tarbouk, E.J. & F.K. Lutgens, (2006), EARTH, 8th edition, Pearson Education International.
Sedimentary material composed of fragments ranging in diameter from 0.0625 mm to 2 mm. Sand particles are larger than silt particles but smaller than pebbles. Much sand is composed of quartz grains because quartz is abundant and resists chemical and mechanical disintegration, however other materials such as shell and rock fragments can also form sand.
This instrument uses in Experimental tectonic laboratories. Sand box experiments explain different tectonics conditions that create geological and structural phenomena. This instrument uses in structural geology and geotechnics.