
1) Cloud above a peak
Found on
https://www.crosswordclues.com/clue/volcanic-ash

1) Explosive party
Found on
https://www.crosswordclues.com/clue/volcanicbash

Volcanic ash consists of fragments of pulverized rock, minerals and volcanic glass, created during volcanic eruptions, less than 2 mm (0.079 inches) in diameter. The term volcanic ash is also often loosely used to refer to all explosive eruption products (correctly referred to as tephra), including particles larger than 2mm. Volcanic ash is formed...
Found on
http://en.wikipedia.org/wiki/Volcanic_ash

(from the article `dating`) ...a layer that is so distinctive in appearance that a series of tests need not be made to establish its identity. Such a layer is called a key bed. ... Ash falls from continued explosive jetting of fine volcanic particles into high ash clouds generally do not cause any direct fatalities. However, ... ...e...
Found on
http://www.britannica.com/eb/a-z/v/33

Volcanic ash collected in Randle, Washington, located about 40 km NNE of Mount St. Helens. The north edge of the eruption cloud of May 18, 1980, passed over Randle and deposited between 1 and 2 cm of ash on the community. At the same distance along the axis of the eruption cloud, however, about 7 cm...
Found on
http://www.daviddarling.info/encyclopedia/A/ash.html

Fine particles of rock powder that originate from a volcano and that may remain suspended in the atmosphere for long periods.
Found on
http://www.encyclo.co.uk/local/22268

A volcanic sediment of rock fragments, usually glass, less than 4 millimeters in diameter that is fo
Found on
http://www.encyclo.co.uk/local/22392

Dust-size particles ejected from a volcano.
Found on
http://www.evcforum.net/WebPages/Glossary_Geology.html

Small sized particles ejected from explosive volcanoes.
Found on
http://www.physicalgeography.net/physgeoglos/v.html

A volcanic sediment of rock fragments, usually glass, less than 4 millimeters in diameter that is formed when escaping gases force out a fine spray of magma.
Found on
http://www.scientificpsychic.com/etc/geology-glossary.html

volcanic ash Fine pyroclastic material. The term usually refers to the unconsolidated material but sometimes is also used for its consolidated counterpart, tuff.
Found on
http://www.wordinfo.info/words/index/info/view_unit/2322/

ash which comes from a volcano's eruption
Found on
https://sciencetrek.org/sciencetrek/topics/dinosaurs/glossary.cfm

The dust-sized, sharp-edged, glassy particles resulting from an explosive volcanic eruption.
Found on
https://www.encyclo.co.uk/local/22327

fragments of rock and pumice thrown out of volcanoes by explosive eruptions, The finest particles are carried long distances by winds.
Found on
https://www.geolsoc.org.uk/ks3/gsl/education/resources/rockcycle/page3451.h
No exact match found.