Type of solidified lava with a clinkery surface, sharp and broken into many pieces. -> See whole entry

Small spherical balls of volcanic ash -> See whole entry

Salt lake in Ethiopia -> See whole entry

agate is a microcrystalline variety of quartz (silica), chiefly chalcedony, characterised by its fineness of grain and brightness of color. -> See whole entry

Agios Georgios is a little harbour on the Methana peninsula in Greece -> See whole entry

Akrotiri is a village in the southwest of Santorini island -> See whole entry

The Alcantara is a river in Sicily. -> See whole entry

Literally translated, "the child of Krakatau", Anak Krakatau is the youngest island of the Krakatau volcanic archipel in the Sunda Strait. It was formed during new eruptions in 1927 when a new island appeared in the caldera left by the huge eruption of Krakatau volcano in 1883.

andesite is a gray to black volcanic rock with between about 52 and 63 weight percent silica (SiO2). Andesites are typical for lava domes and stratovolcanoes. -> See whole entry

Fine-grained volcanic products, usually produced by explosive volcanic eruptions. -> See whole entry

Volcanic ash fall is the deposition of ash from the air from eruption plumes emitted during explosive volcanic eruptions.

Capital of Greece, located on the Attika peninsula of the southern mainland -> See whole entry

The volcanic lake Averna in the Phlegrean fields near Naples -> See whole entry

The most common type of volcanic rock, with a relatively low silica content and typically erupted at shield volcanoes. -> See whole entry

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Bentonite is an absorbent aluminium phyllosilicate generally impure clay consisting mostly of montmorillonite. -> See whole entry

Volcanic blocks are solidified rock fragments greater than 64 mm in diameter. Blocks commonly are ejected during explosive eruptions and consist of older pieces of the volcano's edifice, e.g. parts of the conduit, lava domes or older lava flows. -> See whole entry

lava flow with huge rocks that are pushed bei following lava -> See whole entry

Ejected fragments of fresh magma larger than 64 mm in diameter, often shaped aerodynamically during their flight. -> See whole entry

Volcanic bomb with a cracked surface, similar to bread, caused by the slow expansion of the interior gas bubbles while cooling. -> See whole entry

Large crater, usually several kilometers across, formed by the collapse of the roof of a magma chamber emptied by large explosive eruptions. -> See whole entry

The Castillo de Santa Bárbara, also called Castillo de Guanapay, is situated on the Canarian island Lanzarote in the municipality and townTeguise. -> See whole entry

A cinder cone (or often also called scoria cone) is a steep, conical hill of volcanic fragments that accumulate around and downwind from a vent. The rock fragments, often called cinders or scoria, are glassy and usually contain numerous gas bubbles "frozen" into place as magma exploded into the air and then cooled quickly. Cinder cones range in size from tens to hundreds of meters tall and are usually formed by lava fountains or strombolian eruptions. -> See whole entry

In chemistry, mineralogy, and materials science, a crystal is a solid in which the constituent atoms, molecules, or ions are packed in a regularly ordered, repeating pattern extending in all three spatial dimensions. -> See whole entry

dacite is an igneous, volcanic rock with a high iron content found at many lava-domes. -> See whole entry