concretion

"The doctor used ultrasound to see the baby inside the mother's womb. "

"That sedimentary is made of layers of sand and shells pressed together over time. "

"The coalescence of raindrops on the window created larger droplets that slowly slid down the glass. "

"The aggregated soil."

"The irregulars attacked the government buildings, not following the standard military formations. "

"My sometimes neighbor, a retired teacher, still visits the school occasionally. "

"The droplets coalesced into a puddle."

"The crowd scattered in terror."

"The geologist studied the rocks in the park. "

"He wishes to accumulate a sum of money."

"The small dog underwent the tunnel to get to the other side of the park. "

"The aggregation of student scores showed a significant improvement in math this year. "