This Volcano Is Broad And Low And Is Composed Of Basaltic Lava Flows. What Kind Of Volcano Is It??
2. Shield Volcanoes are constructed from successive flows of basaltic lava that flows easily and spreads widely. Shield volcanoes therefore have broad gentle slopes and are the classic type of volcanoes in Hawaii (Fig. 5.10).
Which type of volcano is formed by the flow of basaltic lava?
shield volcanoes
Most shield volcanoes are formed from fluid basaltic lava flows. Mauna Kea and Mauna Loa are shield volcanoes. They are the world’s largest active volcanoes rising over 9 km above the sea floor around the island of Hawai’i.
What type of volcano has basaltic magma?
What type of volcano is gently sloping large and composed of basaltic lava?
What is a basaltic lava flow?
What are basaltic flows?
How do you know if a volcano makes felsic or basaltic lava?
Temperature: The hotter the lava the lower the viscosity (the thinner it is). The cooler the lava the higher the viscosity (the thicker it is). Composition: he more felsic the lava (the more silica in the lava) the higher the viscosity because silica forms chains in the cooling lava even before it crystallizes.
What are the 3 types of lava flows associated with basaltic lava?
There are three types of basalt lava flows: pillow pahoehoe and a’a.
Is basaltic an explosive lava?
Basaltic eruptions are the most common form of volcanism on Earth and planetary bodies. The low viscosity of basaltic magmas inhibits fragmentation which favours effusive and lava-fountaining activity yet highly explosive hazardous basaltic eruptions occur.
Which kind of lava flows faster basaltic or rhyolitic?
The composition of the molten rock. Basaltic lava flows move much faster than rhyolitic lava flows. Also the amount of gas dissolved in the lava can change the flows ability to flow (viscosity). … During some eruptions vast amounts of lava are released and so the flows tend to be faster.
What volcano is broad and gently sloping?
Shield Volcano. A dome shaped volcano with gently sloping sides and a broad base characteristic of relatively low viscosity basaltic lava eruptions.
What type of volcano has very broad shape with gentle slopes?
Which type of volcanoes have broad bases and steep sides?
These volcanoes have broad bases and sides that get steeper and steeper as you get closer to the top. They frequently have a large crater at the top created during its last eruption.
What are the types of basaltic lava?
What are the two types of basaltic lava flows?
Basaltic lava generally takes two distinct forms known by the Hawaiian terms pahoehoe and aa. Pahoehoe has a smooth wavy surface that resembles twisted rope. It advances by extruding molten toes of lava beneath a thin flexible crust. As it travels pahoehoe lava often changes to blocky flows called aa.
What are the type of lava flows?
How is a basaltic volcano formed?
What type of rock is a basalt?
Basalt is a hard black volcanic rock. Basalt is the most common rock type in the Earth’s crust. Depending on how it is erupted basalt can be hard and massive (Figure 1) or crumbly and full of bubbles (Figure 2).
What is the lava that flows in this volcano?
What are the materials composed by volcanoes?
Volcanic eruptions produce three types of materials: gas lava and fragmented debris called tephra.
What is the composition of lava?
Lava is mostly made of two elements — Si (the symbol for silicon) and O (the symbol for oxygen). Together they make a very strong bond and then get together with other elements like Fe (iron) Mg (magnesium) K (potassium) Ca (calcium) and more.
What type of volcano has felsic lava?
Composite volcanoes
Composite volcanoes are made of felsic to intermediate rock. The viscosity of the lava means that eruptions at these volcanoes are often explosive (figure 2).
What composition lava will flow downhill slowest?
Term Which of the following properties does not depend on the chemical composition of an igneous rock/magma? | Definition grain size |
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Term What is the eruption temperature of basaltic lava? | Definition 1000–1200°C |
Term Which of the following lavas will flow downhill slowest? | Definition rhyolite |
What are the 3 main types of lava?
What type of volcano is Kilauea?
shield volcano
Kīlauea Volcano is a shield volcano located on the eastern slope of Mauna Loa Volcano on the Island of Hawai’i. The volcano is considered to be in the shield-building stage of Hawaiian volcanism.
What is basaltic volcano?
Which two types of volcanoes are associated with the eruption of fluid basaltic lava?
Eruptions of basaltic magma produce shield volcanoes such as Mauna Loa in Hawaii and cinder cones such as Sunset Crater in Arizona. Basaltic magma is low in silica and so has a low viscosity is very fluid and flows easily.
Is lava rock a basalt?
Are basaltic lava flows fast?
(Credit: Griggs J.D.. Public domain.) Fluid basalt flows can extend tens of kilometers from an erupting vent. The leading edges of basalt flows can travel as fast as 10 km/h (6 mph) on steep slopes but they typically advance less than 1 km/h (0.27 m/s or about 1 ft/s) on gentle slopes.
What is basaltic andesitic and rhyolitic?
Magma is molten rock beneath or on the Earth’s surface. It also includes any unmelted mineral grains and dissolved gases. … High temperature and low SiO2 content result in fluid magma (basaltic). Lower temperature and high SiO2 contents result in viscous magma (andesitic and rhyolitic magma).
What type of volcano rhyolitic andesitic or basaltic is the most explosive?
Lavas and pyroclastics are usually andesitic to rhyolitic in composition. Due to the higher viscosity of magmas erupted from these volcanoes they are usually more explosive than shield volcanoes.
Which type of volcanoes have broad bases?
Composite volcanoes have broad bases and steep sides. These volcanoes usually have a large crater at the top. The crater was created during the volcano’s last eruption. Composite volcanoes are formed by alternating layers of magma and ash.
What type of volcanoes form from wide thin layers of lava?
Which type of volcano has gentle slopes and forms at a divergent plate boundary?
Chapter 6 – Part 2
Lava river ? Volcanic smokes 4K
Why China’s Largest Volcano Is So Unusual
BHU PET GEOLOGY 2019 SOLUTION ||PART-2.1||(QUES 37 to 60)FULLY EXPLAINED |||