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…in which they are created. Diamonds form over long periods of time, between 100 km and 200 km below the surface. At this great depth, carbon gets a chance to cool very gradually, forming diamond crystals. When volcanic eruptions occur, magma carries…

…illite boundary clay is a remote possibility that the predomonantly illite boundary clay resulted from the alteration of ejecta dust from a comet impact, but the most likely source was ash from a massive volcanic eruption. The trace elements suggested…

…occurred by volcanic eruptions as indicated elevated Ir levels in vapors from Kilauea Volcano in Hawaii. The other was that there was no impact site known. An essential observation was made by Bohor and Izett in 1986 when they discovered shocked quartz…

…levels. Volcanoes spew out sulphur dioxide and large amounts of pulverized lava rock known as volcanic ash. A big volcanic eruption can darken the sky over a wide region and affect the earth's entire atmosphere. The 1991 eruption of Mount Pinatoubo…

…. Volcanoes were active during this time and could have also killed the dinosaurs. Iridium is usually what makes up meteorites and volcanic eruptions. Scientists have found high levels of iridium in some layers of clay that might prove that a meteorite impact…

…other investigator to solve problems. How does acid rain form and where it comes from? In nature, itself contributes pollution problems worldwide. This is called natural pollution. But pollution produced by nature, such as gases from volcanic eruptions…

…Halalai Halalai is the third youngest and third most historically active volcano on the island of Hawaii. Six different vents erupted lava. Two of the vents generated lava flow into the West Coast of the island. Halalai is shield volcano…

…to as "Tephra". A ring of tephra collects around the vent and, as the eruption subsides, this blocks up the diatreme. Question 2/5 Where have Volcanoes erupted? Volcanoes have erupted in many different places. Volcanoes have erupted in The Philippines, Java…

…will absorb this normal effect. (fig a9) Over long periods of time, the process was accepted and became in balance with the earth. (McLean, 1985, p.1) Then a time of volcanic activity arrived as the Deccan Traps of the late Cretaceous Period erupted and the pieces…

…to be old stream channels. This implies that there could have been liquid water on the surface. The surface of Mars is varied greatly between north and south. This has been largely attributed to volcanism and erosion. Mars is similar to our moon…