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The white line left behind a plane is called a contrail, short for "condensation trail." It is formed when hot, moist engine exhaust mixes with cold air at high altitudes, causing the water vapor to condense and freeze into ice crystals.
When John White returned to Roanoke in 1590, he found the settlement deserted with no sign of the 118 colonists he had left behind. The only clue left behind was the word "CROATOAN" carved on a post, suggesting they may have moved to Croatoan Island or been met with another fate. The disappearance of the Roanoke colonists remains a mystery to this day.
An archaeologist is a person who digs up artifacts left behind by people in the past.
The Celts left behind intricate artwork such as metalwork and jewelry, with designs featuring intricate patterns and symbolic motifs. They also left behind stone monuments such as dolmens and standing stones. The Celtic language and cultural influences have also endured in regions where they once thrived.
In the Stone Age, humans left behind tools made of stone such as arrowheads, axes, and knives. They also left behind cave paintings, burial sites, and evidence of early agricultural practices.
The only clue left behind at the Roanoke settlement was the word "CROATOAN" carved into a tree. This mysterious disappearance of the settlers in 1590 is still unsolved.