manganese nodules

"The ocean separates the continents of Africa and South America. "

"While walking to school, Sarah found a lost wallet on the ground. "

"The company is mining for gold in the remote mountains. "

"Steel is often strengthened by adding manganese during its production. "

"Scientists study plants to understand how they grow. "

"The dog is exploring the backyard for his lost ball. "

"The doctor felt small, hard nodules under the skin on her neck. "

"The room has a wooden floor."

"The oceans separate North America from Asia. "

"Rust is a type of iron oxide that forms when iron reacts with oxygen in the air and water. "

"The children's building blocks, left scattered, underwent a slow concretion into a large, irregular tower. "

"Even from a young age it was clear that she had the potential to become a great musician."