Shield Volcanoes
Q. What kind of magma produces violent volcanic eruptions?
Explosive eruptions are favored by high gas content & high viscosity magmas (andesitic to rhyolitic magmas). The explosive bursting of bubbles fragments the magma into clots of liquid that cool as they fall through the air. These solid particles become pyroclasts or volcanic ash.
Table of Contents
- Q. What kind of magma produces violent volcanic eruptions?
- Q. What type of explosion is a low silica lava volcano?
- Q. Which type of volcano is fueled by low silica magma?
- Q. Which type of magma will produce the least explosive volcanic eruption?
- Q. What causes magma in the lower mantle of earth to rise up toward the crust?
- Q. Which is the thickest layer of earth *?
- Q. Which is hotter the core or the mantle?
- Q. Can we dig into the mantle?
Q. What type of explosion is a low silica lava volcano?
Effusive (Non-explosive) Eruptions If the viscosity is low, non-explosive eruptions usually begin with fire fountains due to release of dissolved gases. When magma reaches the surface of the earth, it is called lava. Since it its a liquid, it flows downhill in response to gravity as a lava flows.
Q. Which type of volcano is fueled by low silica magma?
Shield volcanoes are found wherever fluid low-silica lava reaches the surface of the Earth. However, they are most characteristic of ocean island volcanism associated with hot spots or with continental rift volcanism.
Q. Which type of magma will produce the least explosive volcanic eruption?
The least explosive type of volcano is called a basalt plateau. These volcanoes produce a very fluid basaltic magma with horizontal flows. The form of these volcanoes is flat to gently sloping and they can occupy an area from 100,000 to 1,000,000 square kilometers.
Q. What causes magma in the lower mantle of earth to rise up toward the crust?
Magma has the tendency to rise because it weighs less than surrounding hard rock (liquids are less dense than solids) and because of the pressure caused by extreme temperature. The pressure is reduced as magma rises toward the surface. Dissolved gases come out of solution and form bubbles.
Q. Which is the thickest layer of earth *?
core
Q. Which is hotter the core or the mantle?
New data suggests that the upper parts of Earth’s mantle are around 60°C (108°F) hotter than previously expected. Previous estimates have put temperatures ranging from anywhere between 500 to 900°C (932 to 1,652°F) near the crust, to 4,000°C (7,230°F) closer to Earth’s core.
Q. Can we dig into the mantle?
Drilling To The Mantle Of The Earth Fifty years ago, scientists attempted to drill deep through ocean crust to the Earth’s mantle, an endeavor called “Project Mohole.” That project failed, but scientists are sharpening their drill bits again.
