WorksheetsBowen's Reactivity Series
Total questions: 76
Worksheet time: 38mins
Which of the following minerals is present in ultramafic igneous rocks?
Muscovite
Hornblende
Pyroxene
Biotite
What is the percentage of SiO₂ in mafic igneous rocks?
<45%
45-52%
52-66%
>66%
Which mineral is rare in intermediate igneous rocks?
Quartz
Olivine
Muscovite
Pyroxene
Which group of igneous rocks contains Muscovite?
Ultramafic
Mafic
Intermediate
Silicic
Which of the following minerals is NOT found in intermediate igneous rocks?
Biotite
Olivine
K-Feldspar
Hornblende
Who was able to observe the order at which minerals crystallize by melting rocks of known compositions?
Charles Darwin
Norman L. Bowen
Albert Einstein
Isaac Newton
According to Bowen's Reaction Series, which mineral is the first to crystallize?
Quartz
Biotite
Olivine
Muscovite
In Bowen's Reaction Series, which mineral is part of the Continuous Reaction Series?
Pyroxene (Augite)
Amphibole (Hornblende)
Na-Plagioclase (Albite)
Biotite
Which of the following minerals is the last to melt according to Bowen's Reaction Series?
Olivine
Pyroxene (Augite)
Amphibole (Hornblende)
Quartz
What is the relationship between melting and crystallization in Bowen's Reaction Series?
First to melt = first to crystallize
Last to melt = first to crystallize
First to melt = last to crystallize
Last to melt = last to crystallize
Which mineral is part of the Discontinuous Reaction Series in Bowen's Reaction Series?
K-Feldspar
Na-Plagioclase (Albite)
Biotite
Ca-Plagioclase (Anorthite)
What does the discontinuous reaction series show?
The crystallisation sequence of mafic minerals as temperature decreases.
The melting sequence of mafic minerals as temperature increases.
The crystallisation sequence of felsic minerals as temperature decreases.
The melting sequence of felsic minerals as temperature increases.
Which mineral is the first to crystallize in the discontinuous reaction series?
Biotite
Amphibole
Pyroxene
Olivine
What happens when magma cools slowly?
High temperature minerals react with the melt to form the next mineral in the series.
High temperature minerals remain unchanged.
Low temperature minerals react with the melt to form the next mineral in the series.
Low temperature minerals remain unchanged.
What may occur if magma cools rapidly?
Reactions may be incomplete, so high temperature minerals survive.
Reactions may be complete, so high temperature minerals disappear.
Low temperature minerals may form first.
The magma may not crystallize at all.
What is a reaction rim?
A lower temperature mineral surrounding the inner higher temperature mineral that was reacting to form it.
A higher temperature mineral surrounding the inner lower temperature mineral that was reacting to form it.
A boundary between two different types of minerals.
A zone where no minerals are present.
What does the continuous reaction series explain about the composition of plagioclase feldspar?
How it changes from sodium-rich to calcium-rich
How it changes from calcium-rich to sodium-rich
How it remains constant in composition
How it changes from potassium-rich to magnesium-rich
Which two minerals are involved in the continuous reaction series of plagioclase feldspar?
Anorthite (Ca) and Albite (Na)
Quartz (Si) and Orthoclase (K)
Biotite (Mg) and Muscovite (Al)
Hornblende (Ca) and Augite (Fe)
What happens to the percentage of sodium in the melt as plagioclase forms at higher temperatures?
It decreases
It remains the same
It increases
It fluctuates
What happens at lower temperatures in the continuous reaction series of plagioclase feldspar?
More calcium is taken into the crystal structure
More sodium is taken into the crystal structure
The melt becomes enriched in calcium
The melt becomes depleted in sodium
How can the analysis of ions in plagioclase be used in geology?
To classify sedimentary rocks
To classify metamorphic rocks
To classify igneous rocks
To classify all types of rocks
In which type of rocks is anorthite found according to the continuous reaction series?
Intermediate/silicic rocks
Ultramafic/mafic rocks
Sedimentary rocks
Metamorphic rocks
In which type of rocks is albite found according to the continuous reaction series?
Ultramafic/mafic rocks
Sedimentary rocks
Intermediate/silicic rocks
Metamorphic rocks
What is a solid solution?
A material with a single composition and multiple crystal structures
A material with a wide range of compositions but a single crystal structure
A material with a single composition and a single crystal structure
A material with multiple compositions and multiple crystal structures
Plagioclase can exist as pure Anorthite, pure Albite, or a mixture of both. What is the chemical formula for pure Anorthite?
NaAlSi3O8
CaAl2Si2O8
NaCaSiAlO8
CaSiAl2O8
What is the general formula for a mixture of 70% Anorthite and 30% Albite?
(Na,Ca)(Si,Al)4O8
CaAl2Si2O8
NaAlSi3O8
(Mg,Fe)2SiO4
Olivine has a solid solution series between which two forms?
High temperature Fe-rich and low temperature Mg-rich forms
High temperature Mg-rich and low temperature Fe-rich forms
High temperature Na-rich and low temperature Ca-rich forms
High temperature Ca-rich and low temperature Na-rich forms
What is the general formula for Forsterite to Fayalite in the Olivine series?
(Na,Ca)(Si,Al)4O8
CaAl2Si2O8
(Mg,Fe)2SiO4
NaAlSi3O8
What causes zoning in crystals produced by minerals that have solid solution series?
Growth at different temperatures
Pressure changes
Chemical reactions
Light exposure
What do the cores of the crystal contain more of?
High temperature form
Low temperature form
Medium temperature form
No temperature form
What is the purpose of a ternary plot?
To display varying amounts of elements or minerals in a crystal.
To show the growth rate of bacteria.
To measure the temperature changes over time.
To compare the speed of different vehicles.
How many variables can a ternary plot display?
One
Two
Three
Four
In a ternary plot, what does each vertex represent?
0%
50%
75%
100%
In a ternary plot, what does the face opposite a vertex represent?
0%
25%
50%
75%
In a ternary plot, how much does each parallel line increase by?
5%
10%
15%
20%
What is the composition of the shape labeled as "Square" in the ternary plot?
100% C
55% A, 45% B
40% A, 50% B, 10% C
20% A, 15% B, 65% C
What is the composition of the shape labeled as "Diamond" in the ternary plot?
100% C
55% A, 45% B
40% A, 50% B, 10% C
20% A, 15% B, 65% C
What is the composition of the shape labeled as "Plus" in the ternary plot?
100% C
55% A, 45% B
40% A, 50% B, 10% C
20% A, 15% B, 65% C
What is the composition of the shape labeled as "Cross" in the ternary plot?
100% C
55% A, 45% B
40% A, 50% B, 10% C
20% A, 15% B, 65% C
What is the composition of the shape labeled as "Circle" in the ternary plot?
100% C
55% A, 45% B
40% A, 50% B, 10% C
32-35% A, 32-35% B, 32-35% C
What is the range of composition for the Blue section in a ternary plot?
60-75%
0-30%
10-25%
20-35%
What is the range of composition for the Green section in a ternary plot?
0-20%
60-80%
0-40%
10-25%
What is the range of composition for the Orange section in a ternary plot?
20-35%
15-50%
30-50%
0-30%
What is the primary use of ternary plots as mentioned in the document?
To identify soil types and feldspars from the data.
To measure temperature changes.
To calculate the density of materials.
To determine the pH levels of soil.
In the ternary plot for soil types, what is the percentage of clay in sandy clay loam?
20-35%
40-50%
60-70%
80-90%
Which feldspar is located at the top of the ternary plot for feldspars?
Albite
Anorthite
Orthoclase (Or)
Bytownite
What is the percentage of sand in loamy sand according to the ternary plot for soil types?
10-20%
30-40%
70-90%
50-60%
Which feldspar is found at the bottom right corner of the ternary plot for feldspars?
Albite
Anorthite
Andesine
Oligoclase
What type of minerals will form at the end of both reaction series?
Minerals that will continue to react with the remaining melt
Minerals that will no longer react with the remaining melt
Minerals that are unstable at the surface
Minerals that are rich in iron
What type of minerals will the magma start crystallising as the temperature continues to fall?
Mafic minerals
Ultramafic minerals
Felsic minerals
Intermediate minerals
Which of the following minerals are considered low temperature minerals?
Olivine, Pyroxene, Amphibole
K-Feldspar, Muscovite, Quartz
Biotite, Plagioclase, Hornblende
Magnetite, Hematite, Ilmenite
Why are low temperature minerals most stable at the surface?
Because they are least likely to weather
Because they are most likely to weather
Because they are rich in iron
Because they are rich in magnesium
What does the reverse of Bowen’s reaction series show in relation to weathering?
The order of melting points
The order of crystallization
The order of stability in relation to weathering
The order of mineral density
What is produced when both the continuous and discontinuous series form crystals at the same time?
One immiscible, solid phase
Two immiscible, solid phases
One miscible, liquid phase
Two miscible, liquid phases
What is the term used to describe a system where two immiscible, solid phases are produced?
Eutectic System
Miscible System
Continuous System
Discontinuous System
What is the characteristic of the melting point in a eutectic system?
Higher than the melting point of each constituent part
Equal to the melting point of each constituent part
Lower than the melting point of each constituent part
Not related to the melting point of each constituent part
What is an example of a eutectic system mentioned in the text?
Brass
Bronze
Solder
Steel
At approximately what temperature does solder, an alloy of tin and lead, melt?
150 °C
190 °C
232 °C
328 °C
What does a Binary (Eutectic) Phase Diagram explain?
How a eutectic system will crystallize as it cools.
How a eutectic system will melt as it heats.
The boiling point of a eutectic system.
The freezing point of a eutectic system.
In the Diopside-Anorthite binary phase diagram, what does the term "Liquidus" refer to?
A phase boundary when the last solid particle melts.
A phase boundary when the rock first starts to melt.
The point where three phases occur.
The temperature at which the system is completely solid.
What is the meaning of "Solidus" in the context of the Diopside-Anorthite binary phase diagram?
A phase boundary when the rock first starts to melt.
A phase boundary when the last solid particle melts.
The point where three phases occur.
The temperature at which the system is completely liquid.
What does the term "Eutectic" signify in the Diopside-Anorthite binary phase diagram?
The point where three phases occur (two solids + melt).
A phase boundary when the last solid particle melts.
A phase boundary when the rock first starts to melt.
The temperature at which the system is completely solid.
In the Diopside-Anorthite binary phase diagram, what phases are present in the region labeled "All liquid"?
Only liquid.
Anorthite + Diopside Crystals.
Diopside Crystals + Liquid.
Anorthite Crystals + Liquid.
In the Diopside-Anorthite binary phase diagram, what phases are present in the region labeled "Anorthite + Diopside Crystals"?
Anorthite + Diopside Crystals.
Only liquid.
Diopside Crystals + Liquid.
Anorthite Crystals + Liquid.
In the Diopside-Anorthite binary phase diagram, what phases are present in the region labeled "Diopside Crystals + Liquid"?
Diopside Crystals + Liquid.
Only liquid.
Anorthite + Diopside Crystals.
Anorthite Crystals + Liquid.
In the Diopside-Anorthite binary phase diagram, what phases are present in the region labeled "Anorthite Crystals + Liquid"?
Anorthite Crystals + Liquid.
Only liquid.
Anorthite + Diopside Crystals.
Diopside Crystals + Liquid.
What happens when a cooling path hits a liquidus in a binary phase diagram?
The temperature increases
Crystals start to form
The substance becomes gaseous
The substance remains liquid
At what temperature does the liquid composition of 18% An and 82% Di start to form crystals according to the given binary phase diagram?
1200°C
1300°C
1400°C
1500°C
What happens to the melt as more crystals grow in a binary phase diagram?
The melt remains the same.
The melt begins to deplete in that mineral's composition.
The melt increases in that mineral's composition.
The melt turns into gas.
What type of reaction is described when the cooling continues as temperature falls in a binary phase diagram?
Discontinuous reaction
Exothermic reaction
Continuous reaction
Endothermic reaction
At what temperature does the liquid composition start to deplete in the given binary phase diagram?
1200°C
1300°C
1400°C
1500°C
What happens to the melt when it reaches the eutectic composition?
It remains completely liquid.
It starts to form the first mineral.
It starts to form the second mineral.
It cools down immediately.
What type of reaction occurs when there is no cooling until the melt has gone?
Continuous reaction
Exothermic reaction
Discontinuous reaction
Endothermic reaction
At what temperature does the liquid composition reach 18% An and 82% Di?
1200°C
1300°C
1400°C
1500°C
What is the final rock composition if the melt was at equilibrium?
The final rock composition will match the original melt composition.
The final rock composition will be different from the original melt composition.
The final rock composition will be 50% of the original melt composition.
The final rock composition will be 25% of the original melt composition.
What crystals will form first in a cooling melt at 1575°C containing 90% Anorthite?
Anorthite at around 1525°C
Diopside at around 1400°C
Liquid at around 1600°C
Anorthite at around 1600°C
