1. Give the name of a mid-ocean ridge and its location. For example, if you were

Question

1. Give the name of a mid-ocean ridge and its location. For example, if you were naming a magnatic arc, rather than a ridge, a formal geographic/geologic name for one magnatic arc would be the Aleutian arc in the northern pacific ocean. What is an analogous name for an exampleof a mid-ocean ridge?

2. Explain how the chemistry of magma influences the explosiveness of a volcano. How magma chemistry influences the physical characteristics of the magma? how those physical characteristics influence how explosive a resulting eruption is and why? what does this means in terms of the relationship between magma chemistry and the explosiveness of a volcano.

Explanation / Answer

1.There is the Mid-Atlantic Ridge in the middle Atlantic Ocean.

2.

The composition of the gases in magma are:

Explosive volcanic eruption.

If the magma has a high viscosity, pressure will increase inside of the gas bubble(s). When this magma arrives at the surface, the gas bubbles will have a greater pressure inside, which causes them to burst explosively on reaching atmospheric pressure. This will result in an explosive volcanic eruption.

Effusive (Non-explosive) Eruptions

Non explosive eruptions are initiated by by low gas content and low viscosity magmas. If the viscosity is low, non-explosive eruptions generally begin with fire fountains due to release of dissolved gases.

When magma arrives at the surface of the earth, it is called lava. As it its a liquid, it flows downhill by gravity as a lava flows.

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