Composite volcanoes, also called stratovolcanoes, are formed from layers of lava and rock fragments ejected from a central vent. They often form tall, steep conical peaks over 1000 meters high and can erupt explosively when viscous magma builds up pressure in the vent. Stratovolcanoes display a variety of shapes including concave, pyramidal, and those with multiple summits. Shield volcanoes are broad, gently sloping cones produced by fluid basaltic lava flows over a large area from a central vent. Cinder cones are small, steep hills formed from accumulation of ejected volcanic cinder around a vent.
There are three main types of volcano - composite or strato, shield and dome. Composite volcanoes, sometimes known as strato volcanoes, are steep sided cones formed from layers of ash and [lava] flows. The eruptions from these volcanoes may be a pyroclastic flow rather than a flow of lava.
A PowerPoint Presentation for Grade 9 teachers. This presentation is ONLY suggested guide for teachers to assist them on the discussion after the activities as suggested in the Learner's Module were performed. Please feel free to add comments and suggestions. Thanks!
There are three main types of volcano - composite or strato, shield and dome. Composite volcanoes, sometimes known as strato volcanoes, are steep sided cones formed from layers of ash and [lava] flows. The eruptions from these volcanoes may be a pyroclastic flow rather than a flow of lava.
A PowerPoint Presentation for Grade 9 teachers. This presentation is ONLY suggested guide for teachers to assist them on the discussion after the activities as suggested in the Learner's Module were performed. Please feel free to add comments and suggestions. Thanks!
This document looks at volcanoes in detail. It starts with the definition of volcanoes and the labeling of the different parts of a volcano. Then it looks at the different extrusive and intrusive volcanic features. It also looks at the positive and negative effects of volcanic activity
A very interesting presentation about the Galapagos Islands in the Pacific Ocean. These islands became famous due to the visit by Charles Darwin who promoted the Theory of Evolution.
Operation “Blue Star” is the only event in the history of Independent India where the state went into war with its own people. Even after about 40 years it is not clear if it was culmination of states anger over people of the region, a political game of power or start of dictatorial chapter in the democratic setup.
The people of Punjab felt alienated from main stream due to denial of their just demands during a long democratic struggle since independence. As it happen all over the word, it led to militant struggle with great loss of lives of military, police and civilian personnel. Killing of Indira Gandhi and massacre of innocent Sikhs in Delhi and other India cities was also associated with this movement.
The French Revolution, which began in 1789, was a period of radical social and political upheaval in France. It marked the decline of absolute monarchies, the rise of secular and democratic republics, and the eventual rise of Napoleon Bonaparte. This revolutionary period is crucial in understanding the transition from feudalism to modernity in Europe.
For more information, visit-www.vavaclasses.com
Students, digital devices and success - Andreas Schleicher - 27 May 2024..pptxEduSkills OECD
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In Odoo, the multi-company feature allows you to manage multiple companies within a single Odoo database instance. Each company can have its own configurations while still sharing common resources such as products, customers, and suppliers.
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Bills have a main role in point of sale procedure. It will help to track sales, handling payments and giving receipts to customers. Bill splitting also has an important role in POS. For example, If some friends come together for dinner and if they want to divide the bill then it is possible by POS bill splitting. This slide will show how to split bills in odoo 17 POS.
This is a presentation by Dada Robert in a Your Skill Boost masterclass organised by the Excellence Foundation for South Sudan (EFSS) on Saturday, the 25th and Sunday, the 26th of May 2024.
He discussed the concept of quality improvement, emphasizing its applicability to various aspects of life, including personal, project, and program improvements. He defined quality as doing the right thing at the right time in the right way to achieve the best possible results and discussed the concept of the "gap" between what we know and what we do, and how this gap represents the areas we need to improve. He explained the scientific approach to quality improvement, which involves systematic performance analysis, testing and learning, and implementing change ideas. He also highlighted the importance of client focus and a team approach to quality improvement.
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It is possible to hide or invisible some fields in odoo. Commonly using “invisible” attribute in the field definition to invisible the fields. This slide will show how to make a field invisible in odoo 17.
3. Composite volcanoes, also called Strato volcanoes, they are
formed by alternating layers of lava and rock fragments. This
is the reason they are called composite.
Strato-volcanoes often form impressive, snow-capped peaks
which are often exceeding 2500m in height, 1000sq.km in
surface, and 400km3 in volume.
Between eruptions they are often so quiet they seem
extinct. To witness the start of a great eruption requires luck
or very careful surveillance.
Composite volcanoes usually erupt in an explosive way. This
is usually caused by viscous magma. When very viscous magma
rises to the surface, it usually clogs the crater pipe, and gas in
the crater pipe gets locked up. Therefore, the pressure will
increase resulting in an explosive eruption.
Although Strato-volcanoes are usually large and conical, we
can distinguish different shapes of them: concave , pyramidal,
convex-concave, helmet-shaped , collapse caldera, nested ,
multiple summits, elongated along a fissure .
6. Shield volcanoes are huge in
size. They are built by many layers
of runny lava flows. Lava spills out of
a central vent or group of vents. A
broad shaped, gently sloping cone is
formed. This is caused by the very
fluid, basaltic lava which can't be
piled up into steep mounds.
7. Shield volcanoes may be produced by hot spots
which lay far away from the edges of tectonic
plates. Shields also occur along the mid-oceanic
ridge, where sea-floor spreading is in progress
and along subduction related volcanic arcs.
The eruptions of shield volcanoes are
characterized by low-explosivity lava-fountaining
that forms cinder cones and spatter cones at the
vent. Famous shield volcanoes can be found for
example in Hawaii.
8.
9. A Cinder cone is a steep conical hill formed above a
vent. Cinder cones are among the most common volcanic
landforms found in the world. They aren't famous as their
eruptions usually don't cause any loss of life. Cinder cones
are chiefly formed by Strombolian eruptions. The cones
usually grow up in groups and they often occur on the flanks
of Strato volcanoes and shield volcanoes.
Cinder cones are built from lava fragments called
cinders. The lava fragments are ejected from a single vent
and accumulate around the vent when they fall back to
earth.
Cinder cones grow rapidly and soon approach their
maximum size. They rarely exceed 250m in height and
500m in diameter.
10. The shape of a cinder cone can be
modified during its (short)
life. When the position of the vent
alters, aligned, twin or secant cones
develop. Nested, buried or
breached cones are formed when
the power of the eruption varies.
11.
12. When hot erupting lava contains just
enough explosive gas to prevent the
formation of a lava flow, but not enough
to shatter it into small fragments the
lava is torn by expanding gases into fluid
hot clots, ranging in size from 1cm to
50cm across, called spatter.
When the spatter falls back to Earth
the clots weld themselves together and
solidify forming steep-sided
accumulations. These accumulations
focused on an individual vent are called
spatter cones.
15. Complex Volcanoes can also be called as
compound volcanoes
In fact all volcanoes could be complex
volcanoes since all of them are made up
of multiple flows, ash
layers, domes, cones, etc. in varying
amounts.
However, when we call a volcano a
complex volcano it is because we mean
the "system" of those volcanoes is not
"simple". Caldera complexes for instance
have often got a large caldera with many
subsidiary vents and deposits, some of
which could be considered "volcanoes" in
their own right.
Frankly speaking, a volcano that
consists of a complex of two or more
vents is reckoned as a compound or
complex volcano.
18. How does Volcanoes erupt ???????
An eruption begins when pressure on a
magma chamber forces magma up
through the conduit and out the
volcano's vents. When the magma
chamber has been completely filled, the
type of eruption partly depends on the
amount of gases and silica in the
magma. The amount of silica determines
how sticky (level of viscosity) the magma
is and water provides the explosive
potential of steam.
