a sudden or disastrous event that destroys or changes a whole region or system
a person, thing, or event that provokes or accelerates change or activity by introducing new perspectives or actions
a large weapon that was used in ancient times to throw stones or other objects with great force
a large waterfall where water rushes forcefully over a height
the degree of roundness exhibited by a three-dimensional object
(geometry) a round 3D shape like a ball that is slightly flattened at the top and bottom points
a measuring tool used to determine the roundness of a curved surface
someone who moves from one country to another with the intention of settling there permanently
to leave one's own country in order to live in a foreign country
to disturb or unsettle someone, causing them to feel worried or uneasy
a disruption or disturbance of a normal state of mind or emotions
to temporarily stitch two pieces of fabric together with long, loose stitches that can later be easily removed
a fortified structure extending from a wall, typically angled, for defensive purposes
someone who spends or uses resources recklessly or wastefully
impressively great in amount or degree
a remarkable example of a particular quality, skill, or achievement
