It can also result in stumbling across mystery blobs of grease that concern environmental groups and prompt beach closures. According to The Guardian, several marble-sized balls have washed ashore on nine beaches located in Sydney,

UNSW School of Chemistry Professor Dr Jon Beves says testing will commence to investigate what the mystery balls shutting down Sydney’s beaches are composed of. Nine Sydney beaches have been closed due to the suspected tar balls washing up on the sand.

Sydney’s pumping of primary-treated effluent into the ocean makes us out of step with the rest of the world, a water engineering expert said.

On Tuesday, January 14, nine beaches in Sydney were closed to swimmers due to mysterious balls washing ashore. Local authorities are already trying to determine the origin of these unknown findings. Ocean beaches in Sydney,

Locals were urged to steer clear of a number of beaches by the Northern Beaches Council while they clean up the debris and send it for testing. | ITV National News

But repeated occasions where wastewater is causing pollution and with no clear source must be addressed by the pollution watchdog and Sydney's water authority, Greens environment spokeswoman Sue Higginson said.

All but one of the nine major north Sydney beaches which were closed this week after mysterious ball shaped debris washed up on the sands have now reopened.

On Tuesday, January 14, nine beaches in Sydney were closed to swimmers due to mysterious balls washing ashore. Local authorities are already working to determine the origin of these findings. Sydney's ocean beaches,

Australian authorities closed nine Sydney beaches on Tuesday after mysterious white and grey spherical objects washed up along the coast.