Acidic Lava Domes
-A steep dome shaped volcanic hill made of acidic lava.
- Viscous lava flows out through a vent.
-It accumulates around the vent because it’s viscous.
- Eruptions occur later and lava flows out covering the layers below.
- A steep sided dome shaped mound of volcano is formed e.g. Itasy Massif of Madagascar, Mt. Kenya and Kilimanjaro.
Characteristics
(a) Its dome-shaped
(b) Has steep slopes
(c) Made of acidic lava
(d) Has lava layers
(e) Has steep slopes
(f) Has a narrow base
Basic Lava Domes/Shield Volcanoes
-A low lying volcanic hill made of basic lava.
- Basic magma flows out to the surface through a vent.
- The lava flows far before solidifying because its fluid.
- Eruptions occur later and lava spreads over the old lava.
- A shield shaped mound of volcano is formed e.g. Canary Islands, Cape Verde and Sao Tome which are volcanic Islands in the Indian Ocean.
Characteristics
(a) Dome/shield shaped
(b) Has gentle slopes
(c) Made of basic lava
(d) Has lava layers
(e) Has a broad base
Ash and Cinder Cones
A volcano built from ash and cinder or small fragments of lava.
- Violent vent eruption occurs.
- Ash and pyroclasts are emitted and thrown high.
- Some materials fall and settle around the vent forming a hill.
- Light materials are blown by wind to the leeward side e.g. Chyulu Hills, Teleki and Likaiyu near L. Turkana.
Characteristics
(a) Made of pyroclasts
(b) Asymmetrical about the axis
(c) Cone shaped
(d) Has smooth slopes
(e) Has steep windward slope and gentle leeward slope
marto answered the question on
March 25, 2019 at 06:24