31. The sandstone in the Tithonian is mostly rounded quartz grains, but also 14 % of carbonate rock fragments . 32. As the team searches the desert, Verdeschi mindlessly plods into the gully and shoots off another rock fragment . 33. Xenoliths, rock fragments that become enveloped in a larger igneous rock, are widespread in the Northern Cordilleran Volcanic Province. 34. On April 19, 2012, there were reports of superheated rock fragments being hurled into the air by the volcano. 35. A lahar is a catastrophic slurry of water and rock fragments that rushes down the volcano's tall, steep slopes. 36. Root throw is the process that occurs when a tree topples, raising its rootwad and the rock fragments in it. 37. Primitive bacteria could have hitched a ride on rock fragments crossing interplanetary space and seeded life on Earth, he says. 38. At the bottom of the flow is a layer of coarse rock fragments that burst forth like a shotgun blast. 39. The volcanic eruption has built the new island to a height of 100 m composed of ash and large rock fragments . 40. Montserrat's volcano spewed ash and rock fragments Friday farther into the northern safe zone, continuing this week's 12-hour cycle of eruptions.
