limescale

"My doctor recommended I take a calcium supplement to strengthen my bones. "

"We used two kettles to boil enough water for everyone's tea. "

"Dishwashers wash dishes much more efficiently than most humans."

"I went to the park because the weather was nice. "

"My sister is very helpful, especially when it comes to organizing things. "

"The geologist found a deposit of gold ore in the mountain, far from the surrounding rock. "

"The antacid tablets had a chalky taste. "

"I stopped at the traffic lights."

"The antacid tablet contained a carbonate to neutralize stomach acid. "

"The factory uses machines to assemble the toys quickly. "

"We had to sit in the dark because the electric was cut off."

"The construction crew's working on the new school building is going smoothly. "