1.   She was too preoccupied by her inner turmoil to fully appreciate the bubbling volcanic mud pools in the weird, lunar-like springs.

2.   The walls are painted a dark taupe, the color of volcanic mud.

3.   Those provinces often are ravaged by volcanic mud flows during the typhoon season.

4.   Moreover, the main road connecting Manila to Subic has been damaged by the continued flow of volcanic mud from Pinatubo volcano.