useless trivia: What Word Means: An Earthquake?

Questions

bird droppings are chief ---------- of nauru, an island nation in the western pacific?

bird droppings are chief export of---------- , an island nation in the western pacific?

britain's ---------- river is the brun which runs through burnley in lancashire?

britain's shortest river is the ---------- which runs through burnley in lancashire?

britain's shortest river is the brun which runs through ---------- in lancashire?