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Molten rock under ground?
Magma or lava. Classified as mafic or felsic, depending on it's minerology.
What is the only kind of rock that can form directly from magma?
By definition. A sedimentary rock is formed from sediments, chemical, organic, or clastic. A metamorphic rock has undergone a change in mineral alignment or mineral composition due to heat and/or pressure. An igneous rock forms from solidification of magma via cooling.
Which igneous rock forms when basaltic magma hardens?
Intrusive rock
What does magma with high silica content form?
When it cools and crystallizes into rock, the rock will be described as felsic igneous rock. Examples of felsic igneous rocks are granite, rhyolite, and pumice.
This rock starts out as melted magma?
Igneous
Which is older the sill or the rock surrounding it?
The rock surrounding the sill is typically older because the sill is an intrusive igneous rock body that forms when magma is injected into existing rock and solidified.
Magma injected into older rock?
When magma is injected into older rock, it can form intrusive igneous bodies like dikes, sills, or plutons. The intrusion can cause the surrounding rock to be altered by heat and chemical reactions, creating contact metamorphism. Over time, the intrusive rock may cool and solidify, becoming a distinct geological feature in the older rock.
Which type of intrusive feature forms when when magma is injected into fractures cutting across rock layers?
sill
Which type of intrusive feature when magma is injected into fractures cutting across preexisting rock layers?
sill
Intrusions of the igneous rock are younger or older than the rock layers beneath and surrounding them?
Intrusions of igneous rock are typically younger than the rock layers they penetrate. This is because the magma that forms igneous intrusions is usually injected after the surrounding rocks have already solidified and formed.
What are volcanic necks dikes and sills?
Volcanic necks are solidified magma that fills the vent of an extinct volcano. Dikes are vertical or near-vertical rock formations that form when magma is injected into fractures and solidifies underground. Sills are horizontal rock formations created when magma is injected between layers of existing rock.
A sheet-like body that cuts across rock layers and is produced when magma is injected into a fracture is called a .?
dike.
What is the name of a small igneous rock body emplaced at shallow depths by uplift and arching of the overlying older strata?
A small igneous rock body emplaced at shallow depths by uplift and arching of the overlying older strata is called a laccolith. It is characterized by a mushroom-shaped intrusion that forms when magma is injected between sedimentary strata, causing the overlying rock to arch upwards.
Which type of intrusive feature forms when magma is injected into fractures cutting across preexisting rock layers?
Dikes are intrusive features that form when magma is injected into fractures that cut across preexisting rock layers. Dikes are tabular structures that can range in width from a few centimeters to tens of meters and can extend for kilometers.
Are sills and dikes an example of intrusive igneous activity?
Yes they are. Dikes are tabular discordant bodies that are produced when magma is injected into fractures and Sills are tabular plutons formed when magma is injected along sedimentary bedding surfaces.
What is a sheet like body that cuts across rock layers and is produced when magma is injected into a fraction is called?
A sheet-like body that cuts across rock layers and is produced when magma is injected into a fracture is called a dike. Dikes are vertical or near-vertical geological formations that form when molten rock intrudes into existing rock layers and solidifies. This process often leads to the formation of igneous rock formations.
Describe the factors that might cause magma to form a laccolith instead of a sill?
A laccolith forms when magma is injected into a horizontal crack in the rock layers, causing the overlying rock to arch upwards. This is influenced by factors such as the viscosity of the magma, the amount of pressure exerted, and the density contrast between the magma and surrounding rock. If the magma is less fluid and exerts greater pressure, it is more likely to form a laccolith instead of a sill, which forms when magma intrudes parallel to the rock layers.
