accretionary lapilli
accretionary lapilli Pellets of ash, ranging in size from 2 mm to 64 mm, which commonly exhibit a concentric (‘onion skin’) internal structure. The lapilli are formed by the accretion of very fine ash around condensing water droplets or solid particles, particularly in steam-rich eruptive columns (see ERUPTION). Once formed they can be transported and deposited by pyroclastic fall, surge, or flow processes.
More From encyclopedia.com
Suspended Load , Suspended load consists of sediment particles that are mechanically transported by suspension within a stream or river. This is in contrast to bed or… Hjulstrom Effect , Hjulström effect The contrast between the flow velocity at which a fine-grained cohesive sediment, may be deposited and that at which it will be erod… Debris Flow , Debris flow
Debris flow is a process in which water-saturated masses of material ranging from sand grains to boulders move across low slopes. These f… Saltation , Saltation
Saltation is the transportation of sand grains in small jumps by wind or flowing water . The term does not refer to salt, but is derived fr… Clay , clay, common name for a number of fine-grained, earthy materials that become plastic when wet. Chemically, clays are hydrous aluminum silicates, ordi… Eolian Processes , Eolian processes
Eolian processes are processes of relief formation resulting from the action of wind . The term comes from the name of the Greek god…
You Might Also Like
NEARBY TERMS
accretionary lapilli