Solidified Volcanic Ash
Ash
tephra and ash bombs
Solidified lava, sulphur, volcanic ash.
Tephra is basically ash, rock, cinders, and solidified lava spurted from a volcano.
volcanic - it is made form volcanic ash that has solidified.
Igneous rock is a rock that has solidified from previously melted material.The word from ignis meaning fire in the original Greek.Subdivided into Plutonic, which have solidified underground, and Volcanic which erupt as liquid (and ash) from the earth's surface.
When a volcano erupts, it sends out bits of rock, lava (solidified magma) and ash into the air. Then, gravity pulls the debris towards the ground so the debris drop, or fall, from the air.
When volcanic ash compacts, it creates a rock called Tuff. Tuff is sometimes called tufa when used in construction materials.
Solidified is spelled: S-O-L-I-D-I-F-I-E-D.
A volcanic neck forms when magma solidifies in the vent of a volcano, after the solidification the volcano goes either dormant for an extended period of time or goes extinct. During this period of quiescence the ash around the vent erodes away as well as all the other light material leaving only the spine that was the plug in the vent. This will last the longest as it is very densely solidified magma versus a loose conglomerate of ash on the flanks of the volcano.
tephra, or debris from the eruption of a volcano:)