Silica Defined. Silica is another name for the chemical compound silicon dioxide. Each unit of silica includes one atom of silicon and two atoms of oxygen. If you have never heard of silica before, you might be surprised to hear that you probably come into contact with it every day.
The Fifth Circuit, for example, includes the states of Texas, Louisiana, and Mississippi. Cases from the district courts of those states are appealed to the United States Court of Appeals for the Fifth Circuit, which is headquartered in New Orleans, Louisiana.
The lowest level of state court is usually referred to as a Circuit Court, while the lowest level of the federal court system is referred to as a District Court. As stated in the original answer, Federal District courts are grouped together in Circuits. 3 people found this useful.