Igneous Rocks MCQ Quiz: Trivia!
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Igneous rocks are formed after the cooling and solidification of lava. These rocks generally materialize in shields, basins, extended crust, and oceanic crust. This quiz will test your knowledge about the formation of volcanic (extrusive or intrusive) rocks in different geological conditions. Let's try it out! All the best!
- 1.A rock that forms below the earth's surface is?
- A.
Intrusive
- B.
Extrusive
- C.
Laccolith
- D.
Batholith
- 2.Rock body made from slow-moving magma and forms a mushroom shape.
- A.
Extrusive
- B.
Laccolith
- C.
Batholith
- D.
Pluton
- 3.A rock that is formed at the earth's surface is?
- A.
Laccolith
- B.
Dike
- C.
Batholith
- D.
Sill
- E.
Extrusive
- 4.Is a pluton a?
- A.
Channel way for rising magma
- B.
Intrusion of magma into fractions
- C.
Man made rock
- D.
Large igneous rock body
- 5.Is a sill a?
- A.
A horizontal cinder block
- B.
Channel way for rising magma
- C.
Intrusion of magma into fractions
- D.
All of the above
- 6.Define Erosion.
- A.
Process in which the earth is worn away.
- B.
Process in creating a rock
- C.
Both
- 7.Igneous rock originates when hot, molten material called __________ cools and crystallizes.
- A.
Sediment
- B.
Skarn
- C.
Firn
- D.
Magma
- 8.In a rock with a porphyritic texture, the large crystals are referred to as __________.
- A.
Groundmass
- B.
Orthoblasts
- C.
Erratics
- D.
Phenocrysts
- 9.Igneous rocks rich in dark silicate minerals with about 50 percent silica are said to have a(n) __________ composition.
- A.
Basaltic
- B.
Fine-grained
- C.
Rhyolitic
- D.
Granitic
- 10.Igneous rocks that form from the last minerals to crystallize from magma will have a(n) __________ composition consisting of quartz, potassium feldspar, and sodium-rich plagioclase feldspar.
- A.
Mafic (felsic)
- B.
Basaltic (mafic)
- C.
Andesitic (intermediate)
- D.
Granitic (felsic)