Silt. Silt is granular material of a size somewhere between sand and clay whose mineral origin is quartz and feldspar. Silt may occur as a soil or as suspended sediment in a surface water body. It may also exist as soil deposited at the bottom of a water body.
In North America, a grade-separated junction may be referred to as a grade separation or as an interchange â in contrast with an intersection, at-grade, a diamond crossing or a level crossing, which are not grade-separated. 1 Effects.
Definition of grade for Students. 1 : a division of a school course representing a year's work He's in the fourth grade. 2 : the group of pupils in a school grade Fifth grade is holding a bake sale. 3 : a mark or rating especially in school I got a grade of A on the test.