Relative clauses in the English language are formed principally by means of relative pronouns.

The piazza, designed by Gian Lorenzo Bernini, is formed principally by two colonnades of free standing columns centred on an Egyptian obelisk.

The Penrith club was formed in 1981 from an idea principally from Keith Claxton, a prominent footballer then residing in the Penrith area.

Cell membranes are bilayer structures principally formed from phospholipids, molecules which have a highly water interactive, ionic phosphate head groups attached to two long alkyl tails.

The hamlet is situated on the steep scarp slope of the Greensand Ridge, a prominent escarpment principally formed of Lower Greensand sandstone.

Silk III is formed principally in solutions of fibroin at an interface (i.e. air-water interface, water-oil interface, etc.).

The beach deposits were formed principally during the Miocene Epoch, circa 20 million years ago.

It was from the disbanded ranks of this corps that the 93rd Regiment of Foot was principally formed.

The National Bureau for Handicapped Students (NBHS) was formed in 1984 principally among college staff who themselves had disabilities.

The collection was formed principally by Hans Sloane.