concretions

"The patient followed the doctor's instructions carefully. "

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

"My friend told me there was something in the box, but I didn't know what it was yet. "

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

"The family owns several, a small plot of land behind their house. "

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

"The aggregated soil."

"The bird's nest was a concrete example of how strong and carefully constructed things can be. "

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

"The droplets coalesced into a puddle."

"The process of baking a cake involves several steps, from mixing the ingredients to putting it in the oven. "

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