Volcanoes and earthquakes In the world, there are many natural disasters which occur without the human's contribution. Volcanoes and earthquakes are some disasters that have a huge impact on many things. These two types of natural events can compare or contrast to each other. These natural disasters have differences more than similarities. Volcanoes and earthquakes are different in three things: the geology, the process, and the effect.
At divergent plate boundaries you have high mafic temperatures and very thin crust so gases are unable to get trapped. This forms a nonviolent shield volcano. When a shield volcano erupts the lava flows down the sides and does not build up to tap gasses and at convergent plate boundaries especially with subduction you have intermediate temperatures with lots of gas and water building up under continental crust that is very thick and holds pressure in. This is where more violent volcanos
Helium is good for overhead, because it is lighter and thus flows upward. Argon allows easier arc starting and a smoother, more stable arc than helium does. Actually, argon pretty much is the most widely used shielding gas nowadays. TIG uses a tungsten electrode that is nonconsumable. In other words it does not burn up like an electrode in stick welding or the wire in metal inert gas (MIG) welding does.
These are boundaries where the plats move towards each other but 1 plate travels underneath (subduction). The less dense oceanic plate is the plate that subsides under the denser continental plate. The oceanic plate with melt as it falls to the asthenosphere creating a mantle plume where we expect to see a strombolian (cone) volcano. These volcanoes are typically tall cone shaped volcanoes. They are as such because they lava is andesitic/rhyolitic which means the lava contains 55%+ silica content.
The shield volcano’s shape is actually caused by the way that it forms. Basalt lava, which is thin and flows quickly, oozes out of a fissure in the ground and gradually runs downhill. Basalt lava runs so quickly that it can cover a great distance before it cools and hardens, so shield volcanoes have less steep rises that are extremely large in diameter. This formation process takes a long time, as the lava piles up slowly, eventually resulting in the gradual slope that gives shield volcanoes their name. It makes sense, given the way in which shield volcanoes form (so that their size is gradually increasing and reaches a vast extent) that some of the world’s largest volcanoes are members of the shield classification.
These P waves are able to travel through both solid rock, such as granite mountains, and liquid material, such as volcanic magma or the water of the oceans. The slower wave through the body of rock is called the secondary or S wave. As an S wave propagates, it shears the rock sideways at right angles to the direction of travel. If a liquid is sheared sideways or twisted, it will not spring back, hence S waves cannot propagate in the liquid parts of the earth, such as oceans and lakes. The actual speed of P and S seismic waves depends on the density and elastic properties of the rocks and soil through which they pass.
They are made up of either igneous or sedimentary rocks. The rocks are changed due to the intense heat from magma and the fierce pressure from shifting tectonic plates. Even though the rocks get very hot, they do not melt. If these rocks did melt it would result in the formation of an igneous rock instead of a metamorphic rock. Metamorphic alteration causes the texture and mineral composition to change.
When the pieces of lava collect on a steep slope, then the side of the delta crumbles often and creates a bunch of submarine landslides. Collapses like this can catch unsuspecting people and push them into the ocean and sometimes also cause big explosions. Lava deltas get wider to the sides as well as longer out into the water until a landslide happens or until the lava flow to the water is stopped. First, the pahoehoe lava is thick and slowly moves across the beach or drops over a small cliff. Waves from the ocean slosh onto the lava, causing the lava to cool at a rapid pace and break into tiny glass pieces.
The continental crust floats much more freely on the magma. Movements deep within the Earth, which carry heat from the hot interior to the cooler surface, cause the plates to move very slowly on the surface, about 1 to 10 cm per year. Tectonic plates move because mantle rocks near the radioactive core are heated and the warmer rocks rise while the cooler
The red colour shows basalt or whin sill. This rock is a hard igneous rock. An igneous rock is a rock formed by the result of volcanic eruption, basalt is a form of igneous rock caused by lava cooling quickly. The only reason why the waterfall is here is because of this rock. Without this rock the waterfall would not have occurred because there would have only been a less resistant rock type meaning that a waterfall wouldn’t be able to hold itself from erosion.