Beautiful circles of ice form in some rivers including the Charles. With warmer weather the river ice might break up and and reform with chances to see ice circle. Although rational theories have edged out aliens as explanations there still seems to be uncertainty about
Ice circles began to form on the Charles River in Cambridge, Massachusetts, which runs through the MIT campus, prompting scientists at the university to study their formation.
David Ricks, an ocean engineering graduate, helped systematically rule out effluent from submerged pipes, down draughts from helicopters, alien activity, bubbles from decomposition and underwater springs.
He concluded that eddies from the Harvard bridge caused parts of the sheet ice to break away and the movement of the ice created circular holes which were filled by further ice formation. Other theories suggest that slow moving rivers can create eddies which spin the ice until it takes on a circular shape.
(Image: Ice Circles in Campotosto, Italy by aquilano76)




























