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ReneWhen magma flows horizontally along rock layers, it can form a feature called a sill. Sills are tabular igneous intrusions that are parallel to the surrounding rock layers. They are typically formed when magma is injected between existing rock layers and cools and solidifies underground.
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What happens when magma flows in a horizontal direction along rock layers?
The magma forms sills and magma chambers.
What forms when the rock layers slip or slide along the crack?
A fault forms when rock layers slip or slide along a crack. This movement can create an earthquake if the stress becomes too great for the rocks to hold their position.
Does lava follow the law of superposition?
Lava does not follow the law of superposition. The law of superposition applies to sedimentary rock layers, where older layers are typically found below younger layers due to the principle of original horizontality. Lava flows do not adhere to this principle as they can be deposited on top of existing layers regardless of their age.
Of the three primary forms of subaerial volcanoes consist of alternating layers of tephra and solidified lava?
The three primary forms of subaerial volcanoes are stratovolcanoes, shield volcanoes, and cinder cone volcanoes. Stratovolcanoes are characterized by alternating layers of tephra and solidified lava due to their explosive eruptions and lava flows. Shield volcanoes have gentle slopes formed from successive lava flows with occasional tephra layers. Cinder cone volcanoes are small, steep-sided volcanoes made up almost entirely of tephra fragments from explosive eruptions.
Magma that hardens vertically underneath the surface will form a sill?
Yes, that's correct. Sills are igneous rock formations that form when magma is intruded horizontally between rock layers and then solidifies underground. If the magma solidifies vertically underneath the surface, it will create a sill structure.
