strontia

"He knew something terrible was going to happen."

"My family and I are planning a trip to explore Earth's diverse landscapes. "

"The editor composed a historical journal from many individual letters."

"Rust is an iron oxide. "

"He listened carefully to his mother's concerns, feeling sorrowful about her disappointment. "

"The chemistry class focused on how different elements combine to form new substances. "

"He is a student of life."

"My concentration was high during the important math test. "

"The cashier carefully handled the delicate glass ornament. "

"Humans and birds can perceive color."

""The red color in some fireworks comes from the presence of strontium." "

"The guard blew his whistle to indicate imminent departure."