An extract on #reflectiongram
A related belief is that every person is assigned one's own special jinni, as a counterpart in the spiritual realm to the person in the human realm, also called a qarn, and if the qarin is evil it could whisper to people's souls and tell them to submit to evil desires. The notion of a qarin is not universally accepted among all Muslims, but it is generally accepted that Shayn whispers in human minds, and he is assigned to each human being.
In a hadith recorded by Muslim ibn al-Hajjaj, the companion Abdullah, son of Masud reported: 'The Prophet Muhammad said: 'There is not one of you who does not have a jinn appointed to be his constant companion (qarn).' They said, 'And you too, O Messenger of Allah?' He said, 'Me too, but Allah has helped me and he has submitted, so that he only helps me to do good.'
There are two types of geysers: fountain geysers which erupt from pools of water, typically in a series of intense, even violent, bursts; and cone geysers which erupt from cones or mounds of siliceous sinter (including geyserite), usually in steady jets that last anywhere from a few seconds to several minutes. Old Faithful, perhaps the best-known geyser at Yellowstone National Park, is an example of a cone geyser. Grand Geyser, the tallest predictable geyser on earth, (although Geysir in Iceland is taller, it is not predictable), also at Yellowstone National Park, is an example of a fountain geyser.
There are many volcanic areas in the world that have hot springs, mud pots and fumaroles, but very few have erupting geysers. The main reason for their rarity is because multiple intense transient forces must occur simultaneously for a geyser to exist. For example, even when other necessary conditions exist, if the rock structure is loose, eruptions will erode the channels and rapidly destroy any nascent geysers.
As a result, most geysers form in places where there is volcanic rhyolite rock which dissolves in hot water and forms mineral deposits called siliceous sinter, or geyserite, along the inside of the plumbing systems which are very slender. Over time, these deposits strengthen the channel walls by cementing the rock together tightly, thus enabling the geyser to persist, as mentioned in the previous section.
Geysers are fragile phenomena and if conditions change, they may go dormant or extinct. Many have been destroyed simply by people throwing debris into them while others have ceased to erupt due to dewatering by geothermal power plants. However, the Great Geysir of Iceland has had periods of activity and dormancy. During its long dormant periods, eruptions were sometimes artificially inducedoften on special occasionsby the addition of surfactants to the water.