3. The process that is generating magma at this boundary is the subduction. When one plate subducts under another the pressure and temperature increase. As the temperature and pressure increase, the water is forced out of the minerals and rises to
(page 100, para 1 to page 102) Over time magma can melt through the wall rocks and enlarge the plumbing allowing for more flow and a centralized vent such as the one in Hawaii. Smaller fissures allows less lava to flow and can sometimes allow lava to slow and heal the
Know that the type of metamorphic rock relates to how much heat and pressure the rock was exposed to. Gneiss – a lot of heat. Slate – just a little
The plutonic rocks were formed by magma and are form deep within the Earth. When a volcano erupts, some lava reaches the Earth surface and the lava starts to cool or solidify, but there are a few volcanic igneous rocks in Yosemite. The volcanic rocks in Yosemite Park include basalt and latté lava flows and outside has the same, but some called ash-flow and more (Yosemite National
'The extent to which volcanic processes represent hazards depends on where and when they occur.' Discuss this statement. Volcanic processes become a hazard when they impact upon the human and built environments, killing and injuring people, burying and collapsing buildings, destroying infrastructure and bringing agricultural activities to a halt. Volcanic hazards are influenced by several factors including location, time and frequency of eruptions, and the materials ejected. It is the viscosity of magma that largely determines the nature and power of an eruption and the resultant severity of the hazard.
For example, the origin of puzzling, hilly volcanic deposits near Mount Shasta and Mount Rainier became clear. Gravitational collapse of volcanic flanks is now seen as a normal event at steep-sided volcanoes, even on the ocean floor and on other
He suggested that at the centre of oceans, molten material would rise from the Earth’s mantle, causing new sea floor to be created, pushing the ocean floor. He also suggested that there were ocean trenches where old sea floor would then go back into the mantle, and molten. He found that these ocean trenches, the deepest parts of the ocean, were very near continental plates. Hess theorized that the action of the sea floor spreading caused continents to move apart and so this being evidence for continental drift, showing why it happened. The evidence of sea floor spreading was further supported by Vine and Drummond, who studied the magnetic pattern of the sea floor.
The Island of Aruba is the result of lava hardening from a volcano that occurred almost 100 million years ago underwater. Eventually sediments formed new types of rocks, which came to the surface and began the process of island building. On the Island today the north coast is made up of a jagged coastline filled with all sorts of rocks. “Limestone’s are the youngest rocks that make up Aruba and that surround the islands older rocks. Limestone formed after and on top of the older rocks.” (Archaeological Museum Aruba, 3) While limestone is very common rock on Aruba, a white and black speckled plutonic rock called quartzdiorite is also another prevalent part of the landscape.
These include.... * The eruption had left destruction in its wake, it created a ‘Pyroclastic Flow’ or ‘Nuée ardente’ (Glowing Cloud). This is a cloud of volcanic debris, made up of solid, semi solid and hot, expanding gases. The cloud behaves like a liquid, flowing down the slope of the volcano. It can reach up to and above 100Km/h and so destroys everything in its path. The pyroclastic flow from Mt.
There were also the same fossilised pollen species and rock sediments on these coastlines. Wegener’s ideas were further proved and built upon by other ‘geographers’ which has increased our understanding of tectonics events today. Sea floor spreading was discovered which showed that rock is always being created and destroyed; this lead us to believe in the existence of plates and plate boundaries across the lithosphere. Sea floor spreading has been shown to exist in the Atlantic Ocean where the theory is that the Eurasian and North American plates are moving apart, at what is called a constructive plate boundary. This is where magma rises through a rift and cools