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Mount St Helens lava composition?
The lava composition of Mount St. Helens is typically classified as andesitic, which means it contains a mixture of minerals such as plagioclase feldspar, pyroxene, and amphibole. Andesitic lava is known for being thicker and more viscous compared to basaltic lava, which can contribute to explosive eruptions from stratovolcanoes like Mount St. Helens.
Is dike a type of lava flow?
A dike is not a type of lava flow, but rather a sheet-like intrusion of igneous rock that cuts across existing rock layers. Dikes form when molten rock (magma) is injected into fractures in the Earth's crust and crystallizes before reaching the surface.
Lava is an example of what kind of rock?
Lava is an example of igneous rock. It forms when molten rock from beneath the Earth's surface erupts onto the surface and cools and solidifies.
What feature is formed when lava cuts across rock layers and hardens?
A dike is formed when lava cuts across rock layers and hardens. This igneous intrusion results in a narrow, tabular rock formation that can be exposed on the Earth's surface due to erosion or uplift.
Is a lahar is an example of a pluton?
No, a lahar is not an example of a pluton. A lahar is a volcanic mudflow that occurs when volcanic debris mixes with water, flowing down the slopes of a volcano. A pluton, on the other hand, is an igneous intrusion formed underground by the solidification of magma.
Why are there no fossils in a intrusion?
If you mean an intrusion via magma/lava, then fossils would not exist due to the fact that most fossils are found in SEDIMENTARY rock, not IGNEOUS (magma/lava rocks).
Mount St Helens lava composition?
The lava composition of Mount St. Helens is typically classified as andesitic, which means it contains a mixture of minerals such as plagioclase feldspar, pyroxene, and amphibole. Andesitic lava is known for being thicker and more viscous compared to basaltic lava, which can contribute to explosive eruptions from stratovolcanoes like Mount St. Helens.
What is a example of magma?
Lava
How many caves are formed by erosin?
All except lava-tubes, which result from lava draining from under the solidified crust of a lava flow. Most are in limestone, soluble in water acidified by carbon-dioxide from the atmosphere (chemical weathering).
What are the changes extrusive volcanic features may undergo over time?
Extrusive volcanic features, such as lava flows and volcanic cones, can undergo changes over time due to weathering and erosion. Weathering breaks down the rock material, while erosion removes the material, shaping the landforms. This process can result in the gradual leveling of volcanic cones and altering the appearance of lava flows.
What is a living example of a lava lamp?
A volcanic eruption is a living example of a lava lamp, where molten lava rises to the surface, cools, and solidifies. The cycle repeats as new lava continues to flow, resembling the movement of the liquid wax in a lava lamp.
This massive underground lava upwelling is sometimes called an igneous what?
When magma below the earth's surface penetrates the crust but does not break the surface, it is called an igneous intrusion.
How can you tell the difference between an intrusion and extrusion if there is a layer of sandstone on top?
An intrusion is formed when magma pushes into surrounding rock layers, creating intrusive features like veins or sills, which would be visible beneath the layer of sandstone. In contrast, an extrusion occurs when magma is ejected onto the surface as lava, forming extrusive features like lava flows or volcanic cones above the sandstone layer. The presence of different types of volcanic features would help distinguish between an intrusion and an extrusion in this scenario.
How is a cave?
Caves can form in a variety of ways, but most caves are dissolutional and are initially formed by chemical weathering of surface rock, usually limestone, by carbonic acid contained in rainwater. As chemical weathering continues, mechanical weathering joins in the fun to further attack and widen joints and fissures in what is usually soluble sedimentary rock, like limestone.Some other types of caves are formed by percolating sulfuric acid, flowing lava, flowing water in glaciers, wave action, and particle abrasion.
Is dike a type of lava flow?
A dike is not a type of lava flow, but rather a sheet-like intrusion of igneous rock that cuts across existing rock layers. Dikes form when molten rock (magma) is injected into fractures in the Earth's crust and crystallizes before reaching the surface.
Lava is an example of what kind of rock?
Lava is an example of igneous rock. It forms when molten rock from beneath the Earth's surface erupts onto the surface and cools and solidifies.
Which happened first intrusion or extrusion?
Extrusion generally occurs before intrusion in the context of geological processes. Extrusion happens when lava flows onto the Earth's surface, creating landforms like lava flows and volcanic domes. Intrusion occurs when magma solidifies below the Earth's surface to form features like plutons, dikes, and sills.
