The mysterious rumbling around the world

An unexplained sound rumbled through the world

It seemed to start on February 11th and was first reported in Canada. The rumbling continued for nine days, and it was reported in countries all over the world, including the United States, the United Kingdom, Australia, and New Zealand.

The cause of the rumbling

The cause of the rumbling is still unknown. Some scientists believe that it may have been caused by a volcanic eruption or an earthquake. Others believe that it may have been caused by a meteor or a sonic boom.

Possible causes of the rumbling

• Volcanic eruption
• Earthquake
• Meteor
• Sonic boom

There is no definitive answer to what caused the rumbling, but scientists are continuing to investigate.