tectonics: volcanoes - case studies and pictures
DESCRIPTION
A collection of images of the wonderful and weird variety of volcanoes across the globe, most of these form part of a mini case study that you should have some sort of anecdotal evidence for use in an essay.TRANSCRIPT
Volcanoes
The Rift Valley
Chain of spatter cones (foreground) from a linear eruption between Erta Ale and Hayli Gubbi. Note fault scarp parallel and behind the alignment.
Ol Doinyo Lengai
The cone of Lengai (crowned by white lava overflows) stands in the middle of Rift Valley (Rift west scarp on the right).
The typical aa front (about 5cm thick) of a lava flow coming out from the lava lake T49E.
Lengai at Night
Meduse's Hairs born from the lava lake? Volcanologists call them «Intestinal Flows»: they are due to magma differentiation.
Nyiragongo
Erta Ale
Pa Hoe Hoe at Erta Ale
Marco has discovered that Pelee is blonde: Her heir is fair, not black (as in Hawaii), on Erta Ale!
Montserrat
Dallol
When a pond dries out strange salt "bushes" rising from the bottom indicate the former water level.
Dallol Lake
Spectacularly green-coloured ponds below some active salt hornitos.
Sublimation from fumaroles causes salt to deposit in some strange shapes like branches in the wind.
Dozens of hornitos are active within a small area, together creating a symphony of whistles and puffing.
An active hornito ejects water with plenty of minerals which form deposits mimicking a head covered by grey hair.
Krakatoa
Yellowstone
Vulcano
Stromboli
Pamukkale
Pelee