shield or stratovolcano

Volcano Table | Volcano World | Oregon State University
Volcano Table | Volcano World | Oregon State University
Stratovolcano -1.51 : 29.45 : 4507 : Karthala: Comoros : Shield -11.75 : 43.38 : 2361

Basaltic magmas generated by flux melting of the mantle overlying the subduction zone. In fact, it is quite common to find much smaller cinder cones adorning the flanks of these giant mountain-sized volcanoes. A classic example is the East African Rift Valley, where the African plate is being split.

The low viscosity of the magma allows the lava to travel down slope on a gentle slope, but as it cools and its viscosity increases, its thickness builds up on the lower slopes giving a somewhat steeper lower slope. In Oregon and Washington of the northwestern U. Thus, a given volcanic landform will be characteristic of the types of material it is made of, which in turn depends on the prior eruptive behavior of the volcano. Calderas form as a result of collapse of a volcanic structure. This volcano was born in a farmers corn field in 1943 and erupted for the next 9 years.



Volcanic Landforms, Volcanoes and Plate Tectonics
Shield volcanoes are composed almost entirely of relatively thin lava flows built up over a central vent. Most shields were formed by low viscosity basaltic ... shield or stratovolcano What is a Stratovolcano? - Extreme ScienceAnother type of classical cone-shaped volcano is the stratovolcano. However, when it comes to size and the ability to pack a serious punch, stratovolcanoes outclass ...

If we look at the global distribution of volcanoes we see that volcanism occurs four principal settings. Long periods of repose (times of inactivity) lasting for hundreds to thousands of years, make this type of volcano particularly dangerous, since many times they have shown no historic activity, and people are reluctant to heed warnings about possible eruptions. The steep slope near the summit is due partly to thick, short viscous lava flows that do not travel far down slope from theĀ  vent.

Quite possibly the largest volcanic eruption to occur in recorded history, Tambora ejected so much material when it erupted that the top of the volcano caved in, forming this enormous caldera, visible from space. Hot spots tend to be fixed in position, with the plates moving over the top. Cinder and tephra cones usually occur around summit vents and flank vents of stratovolcanoes. Stratovolcanoes sometimes have a crater at the summit that is formed by explosive ejection of material from a central vent. Another type of classical cone-shaped volcano is the stratovolcano.


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