No. While volcanic ash can have a basaltic composition, it usually does not. Basalt forms from lava. Volcanic ash forms tuff.
It forms by volcanic activity in the vent of a volcano.
Magma that is ejected during a volcanic eruption forms extrusive igneous rocks. They are also referred to as volcanic rocks.
When the top of a volcanic mountain collapses, it forms a volcanic crater or caldera. This creates a bowl-shaped depression at the summit of the volcano.
Volcanic activity.
1. Oceanic trenches. 2. Volcanic islands. 3. Volcanic mountains. and 4. Volcanic arcs.
A volcanic vent.
Volcanic.
through volcanic eruption
a volcanic neck
Volcanic rock forms by lava that has come from a volcano, cools and solidifies to form the rock.
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