A Basalt Forms Under Which of the Following Conditions

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A felsic magma cooling on Earths surface. Basalt is characterized by a specific gravity of 2733 gcm 3 porosity of 128 weathering resistance compressive strength up to 3000 kgcm 2 and hexagonal columnar joint development.

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Basalt has small crystals.

. At mid-ocean ridges on ocean islands on oceanic or continental crust above subduction zones. Basalts occur in every tectonic environment so we need to know a little more about them before we can successfully use them as indicators of tectonic and magmatic processes. If a basalt body cuts across a fault what are the relative ages of the basalt and the fault.

Vesicular and Amygdaloidal Textures Rock forming basalt. The intrusion of a narrow sill or igneous dike below the crust also results in the formation of basalt. Basalt is an example of extrusive igneous rocks.

Among other characteristics mafic minerals and rocks are generally dark in color and high in specific gravity. Tap again to see term. A basalt would form under conditions that included.

Basalt has a blackbrownish-black color. Lava skin becomes ductile as it cools and slumps together forming rope like texture. Generally igneous rocks are formed from molten magma.

E none of the above. C a mafic magma cooling on Earths surface. It can form volcanic islands when it is erupted by volcanoes in ocean basins.

It is usually fine-grained due to rapid cooling of lava on the Earths surface. Since the cooling off appears to very quick the. Click again to see term.

The basalt melts expands and becomes less dense. Tap card to see definition. The dark plains on the Moon known as maria and possibly the volcanoes on Mars and Venus are made of basalt.

Pahoehoe basalt forms when lava has low viscosity flows easily like water or flow is smooth. Basalt is a common gray to black volcanic rock. A basalt would form under conditions that included A.

D a felsic magma cooling on Earths surface. Igneous rocks can be extrusive or intrusive base on the formative environment. Pillow basalt forms when lava erupts under water and cools almost instantly.

Basalt like most dark magmas has a low amount of silica. Some of it erupts on land too but to a first approximation basalt is an oceanic rock. Aphanitic phaneritic and porphyritic are textural terms that.

This is in large part due to the amount of iron magnesium and several other relatively heavy. B ə ˈ s ɔː l t ˈ b eɪ s ɔː l t is an aphanitic fine-grained extrusive igneous rock formed from the rapid cooling of low-viscosity lava rich in magnesium and iron mafic lava exposed at or very near the surface of a rocky planet or moonMore than 90 of all volcanic rock on Earth is basalt. Basalt forms when mantle rocks peridotite start to melt.

The rock has also built huge plateaus on land. A felsic magma cooling in the subsurface. Four main environments where basalts occur are defined.

Tectonic Environments and eruptions Which of the following statements about basalt is NOT true. ˈ b æ s ɔː l t-əl t. Basalt forms at the surface and has small crystal grains and is therefore an extrusive rock.

Basaltic magmas have the. The basalt must be older according to the principle of original horizontality D. A a mafic magma cooling in the subsurface.

The fault must be older according to the principle of cross-cutting relationships C. On the other hand basalt flows block the main stream channel resulting in a surface depression in which sedimentation of silt clay or volcanic ash provides an impervious layer. ROCKS MINERALS 6.

Click card to see definition. Start studying Rock cycle task cards. Its dark and dense because its richer in the dark heavy minerals bearing magnesium.

It basically means that melt that forms has a different composition from the source rocks. Rapid-cooling fine-grained basalt is. Basalt forms when magma cools very quickly.

Compared to the familiar granite of the continents basalt ba-SALT is darker denser and finer grained. As basalt forms at the mid-ocean ridge which of the following is correct. B a felsic magma cooling in the subsurface.

Aa basalt forms when lava has high viscosity flows poorly like honey or flow is turbulent. The basalt cools contracts and becomes more dense. The basalt cools expands and becomes less dense.

Basalt makes up large parts of the ocean floor. Their relative ages cannot be determined based on the information given B. Recent basalts cover the underlying drainage pattern forming buried channels where the groundwater may be trapped under confining conditions.

Has small crystals is an intrusive igneous rock forms from heat and pressure forms from contact metamorphism Weegy. Of course it can only happen if rocks melt only partially but this is exactly what happens in the upper mantle. Basalt is primarily formed by the extrusion of lava flows onto the surface of the earth during a volcanic eruption.

When this magma solidified in the interior part of. Often basalt- low silica makes lava runny. When basalts form at the surface it does not have to be on a dry surface as many basalts form in.

Basalt is considered a mafic silicate rock. A mafic magma cooling on Earths surface. Basalt is an igneous rock formed from the lava flows that cool off pretty quickly either on the surface or very close to the surface.

Basalt is the dark heavy volcanic rock that makes up most of the worlds oceanic crust. It is easy to exploit. None of the above.

PAGE 7 LAB EXERCISE 2. A mafic magma cooling in the subsurface. Basalt is a type of igneous rock that is typically dark in coloration with a fine-grained texture.

Basalt often occurs in a large area of rock flow or crust and sometimes in dikes beds stocks basins caps dikes etc. Learn vocabulary terms and more with flashcards games and other study tools. The cooling appears to be very quick because the lava is exposed to a much lower temperature that its own temperature thus starting to cool of loses its liquidityviscosity and becomes solid.

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