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There's a range for lava flow that stretches from a few inches to a number of miles. It depends mostly on a lava's viscosity. Highly vuc\\iscous lava volcanoes, such as Mt. St. Helens, tend to erupt violently, but lava flows are slow and quick to solidify. Underwater eruptions may have lava that solidifies on the outside almost instantly. Extremely low viscosity lava flows, like those in Hawaii, may run for days and cover miles before solidifying.

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What are the four types of lava that form at hot spots and their characteristics?

Aa is lava that forms a thick ,brittle crust . Pahoehoe is a lava that forms a thin crust. Pillow lava forms when lava erupts underwater. Blocky lava is kool, stiff lava that does not travel far from thr eruption site.


What term best describe the ability of lava to flow?

The term that best describes the ability of lava to flow is "viscosity." Viscosity refers to the thickness or stickiness of a fluid, which influences how easily it can move. In the case of lava, its viscosity is determined by factors such as temperature, composition, and gas content, affecting how far and fast it can travel. Lower viscosity lava flows more easily, while higher viscosity results in slower, thicker flows.


Why does the lava from composite volcanos harden quickly?

Lava from composite volcanoes, or stratovolcanoes, is typically more viscous due to its higher silica content compared to basaltic lava from shield volcanoes. This increased viscosity means that the lava flows more slowly and doesn't travel far, allowing it to cool and solidify more quickly upon exposure to the atmosphere. Additionally, the steep slopes of composite volcanoes promote rapid cooling as the lava encounters cooler air and surface temperatures.


What are the streams of molten lava spilled out of a volcano called?

Streams of molten lava out of a volcano are called 'lava flows'.


Does a composite volcano have an Aa type of lava?

A'a can occur at composite volcanoes, but block lava flows, which are far more viscous, are more common.