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unstable


unsteady; likely to fall, move, or sway

The house of cards became more and more unstable with each card Adam added to the top.

unstable

speculates


forms a theory about something without knowing all the facts

The historian speculates that Stonehenge, an ancient circle of stones in England, was once a burial ground.

speculates

settlement


a place where people set up a new community

After arriving in America in 1620, the Pilgrims built a settlement called the Plymouth Colony in what is now Massachusetts.

settlement

artifacts


objects made or used by people long ago

The Egyptian artifacts were placed in a museum for visitors to see.

artifacts

pioneering


the first or among the earliest to do something

Amelia Earhart was a pioneering figure in aviation history.

pioneering
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