The resin eventually hardens into amber, a yellow or brownish yellow translucent natural polymer similar to plastic.

The other rib and limb bones eventually hardened from their vestigial origins in the cartilage of fishes.

There would be more on his back and shoulders: newly healed wounds which would eventually harden.

Finally, they approached a set of whispers that did not fade and, as they continued walking, eventually hardened into the fuller tones of normal speech.

Mud eventually hardens into dirt, unless water reaches it, in which the water turns to mud instantly.

As the sediment collected, it was subject to increasingly large amounts of pressure which eventually hardened it into limestone.

This eventually hardened into the limestone bedrock, which can be seen in the caverns today.

The resin eventually hardened into amber, which, after many millions of years, was excavated near the town of Jezzine in Lebanon.

Amber starts out as a sticky tree resin that eventually hardens and polymerizes into a substance chemically similar to plastic.

Calcium carbonate is deposited by the water as a soft jelly, but this eventually hardens into travertine.