What is the difference between a stratovolcano and a shield volcano?
Composite volcanoes, also known as stratovolcanoes, are towering structures, often rising more than 10,000 feet. Shield volcanoes are broad, typically 20 times wider than they are high. These volcanoes can be massive.
Which is more dangerous stratovolcano or shield volcano?
Stratovolcanoes show inter-layering of lava flows and pyroclastic material, which is why they are sometimes called composite volcanoes. Due to the higher viscosity of magmas erupted from these volcanoes, they are usually more explosive than shield volcanoes.
Why do shield volcanoes have thin lava?
Shield volcanoes consist largely of thin lava flows, with minor pyroclastic (mainly ash) layers. The gentle slopes are the result of the low lava viscosity, allowing lavas to flow fast and far. The lava flows (pahoehoe and aa) commonly initiate their path from flank vents and fissures rather than from the summit.
Which volcanoes are more likely to explode thick lava or thin lava?
Which volcanoes are more likely to explode, the ones with thick lava or thin? Why? What evidence do you have? The thick lava because the thick lavas creaters are smaller and don’t have enough air, so when the bubbles float up to the top there will be too,much bubbles.
Does a shield volcano have thin or thick lava?
Shield cones are very low and very broad shaped volcanoes. These volcanoes erupt many times over the same area forming huge, and thick lava plateaus. The lava that flows from both types of eruptions is very hot, thin, and runny which allows for fast flowing lava flows.
Is thin or thick lava more dangerous?
Viscous lava will trap pockets of gas within the rock, and not let them pop as bubbles on the surface. But most importantly, highly viscous lava is associated with explosive eruptions and dangerous pyroclastic flows. An example of a low viscosity (fast flowing) lava is basaltic lava.
Are shield volcanoes dangerous?
The lava flow from a shield volcano eruption is largely composed from basaltic magma. The lava features a low viscosity and erupts in a relatively gentle stream. Therefore, shield volcano eruptions generally do not pose a threat to human lives, as the lava flow is easy to predict and avoid.
When many layers of thin runny lava build up a high level area the result is a?
lava plateau
Why do geologists call volcanoes windows into Earth’s interior?
1. Volcanoes are windows into how the Earth works. They occur because the Earth’s rigid outer shell, the crust and upper mantle, is broken into a mosaic of plates that are in constant motion.
When ash cinders and bombs build up?
Ash, cinders, and bombs build up in a steep pile to form CINDER CONE volcanoes. A DIKE forms when magma forces itself between rock layers and hardens.
Does thin runny lava harden into ash cinders and bombs?
Alternating layers of lava and volcanic ash are found in? T or F. Many volcanoes are found in island arcs that form where two oceanic plates collide. Thin, runny lava usually hardens into ash, cinders, and bombs.
What is the result when ash cinders and bombs build up in a steep pile around a volcano’s vent?
When ash, cinders and bombs build up in a steep pile around a volcano’s vent, the result is a composite volcano. Further Explanation: A volcano is an open pore in the earth’s crust from which the molten rocks, gases and debris appear on the surface.