What type of volcano is composed of basalt?
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What type of volcano is composed of basalt?
Shield Volcanoes
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).
What type of volcano is associated with a basaltic caldera?
shield volcanoes
Basaltic calderas have a concentric ring pattern resulting from a series of gradual collapses rather than a single event. They are often found at the summit of shield volcanoes such as the craters at the tops of Mauna Loa and Kilauea. Resurgent calderas are the largest volcanic structures on Earth.
Which is not type of volcano?
Detailed Solution. The correct answer is option 3 i.e. Latite. Latite is a volcanic rock, while the rest are types of volcanoes. Latite is an igneous, volcanic rock and has an aphanitic-aphyric to aphyric-porphyritic texture.
What are the basaltic type of magma volcano?
Basaltic magma is commonly produced by direct melting of the Earth’s mantle, the region of the Earth below the outer crust. On continents, the mantle begins at depths of 30 to 50 km. Shield volcanoes, such as those that make up the Islands of Hawai’i, are composed almost entirely of basalt.
What elements is basalt made of?
Basalt generally has a composition of 45–52 wt\% SiO2, 2–5 wt\% total alkalis, 0.5–2.0 wt\% TiO2, 5–14 wt\% FeO and 14 wt\% or more Al2O3. Contents of CaO are commonly near 10 wt\%, those of MgO commonly in the range 5 to 12 wt\%.
What type of volcano has basaltic magma?
Shield volcanoes
Shield volcanoes are formed by basaltic magma, typically above a mantle plume, whereas the stratovolcanoes (sometimes referred to as composite volcanoes) are formed by andesitic/rhyolitic magma.
What are the 6 types of volcanoes?
Volcanic eruptions may fall into six major types: Icelandic, Hawaiian, Strombolian, Vulcanian, Pelean, and Plinian.
What type of volcano is Krakatoa?
stratovolcano
Mount Krakatoa is an example of a stratovolcano, a tall, conical volcano with multiple strata of solidified lava, tephra, as well as volcanic ash. These type of volcanoes typically have steep sides and usually erupt frequently & violently. Most of the popular eruptions have been made by stratovolcanoes.
Which of the following is not true of basaltic lava flows?
Alkaline lavas
| Component | Nephelinite | Rhyolite |
|---|---|---|
| MgO | 12.1 | 0.4 |
| CaO | 12.8 | 1.3 |
| Na2O | 3.8 | 3.9 |
| K2O | 1.2 | 4.1 |
Which of the following is not a major volcanic area?
Earthquake and Volcano Unit
| A | B |
|---|---|
| Which of the following is NOT a major volcano cone type? | mantle plume |
| This area is both a major earthquake zone and volcano zone. | Pacific Ring of Fire |
| Which of the following are major volcanic areas? | mid-ocean ridges, boundaries of tectonic plates and subduction zones |
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 are the different types of basalt eruptions?
Basalt that erupts under open air (that is, subaerially) forms three distinct types of lava or volcanic deposits: scoria; ash or cinder ( breccia ); and lava flows. Basalt in the tops of subaerial lava flows and cinder cones will often be highly vesiculated, imparting a lightweight “frothy” texture to the rock.
What are the different types of volcanoes made of?
These types of volcanoes are tall conical mountains composed of lava flows and other ejecta in alternate layers, the strata that give rise to the name. Composite volcanoes are made of cinders, ash, and lava.
What are the characteristics of a lava volcano?
They are built by slow eruptions of highly viscous lava. They are sometimes formed within the crater of a previous volcanic eruption. Like a composite volcano, they can produce violent, explosive eruptions, but their lava generally does not flow far from the originating vent.
Where are the most active volcanoes in the world?
The most active volcano in the world is found in Kilauea volcano in Hawaii. Other most active volcanoes are Etna in Italy and Piton de la Fournaise on La Reunion island. What are volcanic rocks? Volcanic rocks are the igneous rock that is found in the volcanic regions. They are fine-grained, glassy textured rocks.