Geologists often study igneous rocks to understand the Earth's volcanic history.

In the mountain range, metamorphic rocks reveal the region's intense geological history.

The old fishing boat rocked along the coastline as the sun set.

The old ferry was rocking along the choppy bay as passengers clung to the rail.

The small boat rocks along the gentle waves as we head toward the harbor.

She carefully cleaned the ninja rocks before adding them to her display shelf.

The toy soldier rocked and rolled across the floor after the child pushed it.

The band was rocking and rolling through the night, keeping the crowd on their feet.

The boat rocks and rolls as the storm intensifies.

After the head injury, tiny ear rocks in his inner ear made him feel perpetually off-kilter.