Florida Gateway College
Earth Science/Dr.Kane
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PART - I KEY - TERMS /Homework
Related Video-test for Chapter 3 is Earth revealed: "Intrusive Igneous rocks" found at http://www.learner.org/resources/series78.html?pop=yes&pid=312
Homework: Please, research these keywords in your textbook, study guide, and other documents you may have. You will get extra information on the video, the test day. Pay attention to the video, and take notes if you like, but you may not use them during the test. You are welcome to watch the video (Earth revealed:
Lesson 14 "Intrusive Igneous Rocks") in advance at the Media Center. You will have 4 extra credit questions that count for 20%.
Contrast lava and Magma
Intrusive, Plutonic rocks, (Definition/how and where does it form)
Extrusive, Volcanic rocks (Definition/how and where does it form)
Mafic rocks, Felsic rocks, Intermediate rocks or magma (Definition, chemical composition, and viscosity).
Granite, Diorite, Rhyolite, Andesite, Basalt (Origin, type of magma, texture, rate of cooling)
Relate Crystals size of minerals (texture) to cooling rate (slow or fast) of a magma and to level of crystallization of magma relative to the Earth crust
Phaneritic texture, Aphanitic texture, porphyritic texture, Obsidian (Definition, rate of cooling, and type of magma)
Bowen’s Reaction series (which minerals crystallize first, and which crystallize last)
Relate water content of magma to temperature of crystallization of magma (rock's melting point)

Differentiation of magma (Definition)
Oceanic crust, continental crust (dominant rock in)
Andesite and plate boundary (plate boundary where andesite/andesitic magma is found the most)
Convergent plate boundaries (common rock in)
Divergent plate boundaries (common rock in)
Detrital, chemical, and chemical inorganic sedimentary rocks: what’s the difference
Name a sedimentary rock of each type.
What creates metamorphism? Where in America would you expect to find lots of metamorphic rocks and why?
Define and contrast regional and contact metamorphisms
Explain how marble forms
Explain the lithification process
Define and contrast chemical weathering and mechanical weathering
What is sheeting, exfoliation
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PART – II:
Homework for Test 2 :
Chapter 2: Rocks, Materials of the Solid Earth
2.
Circle the correct answer
1. Lava is when magma extrudes the Earth's crust through a volcanic eruption a. True _______________ b. False ______________
Intrusion a. b.
means ascent of magma and crystallization into the earth crust
True _______________
False _______________

9.
7.
8.
4.
3.
5.
6.
When magma cools an crystallizes underground inside the earth crust it forms a. b. c. d. e.
Intrusive, plutonic, igneous rocks
Extrusive, volcanic, igneous rocks
Sedimentary rocks
Metamorphic rocks
None of the above
When magma cools and crystallizes on the surface of the earth crust it forms a. b. c. d. e.
Intrusive, plutonic, igneous rocks
Extrusive, volcanic, igneous rocks
Sedimentary rocks
Metamorphic rocks
None of the above
Mafic rocks are dark-colored igneous rocks with minerals rich in Iron and Magnesium, and poor in silica a. b. a. b.
c.
True ________________
False _______________
Granite is a
Mafic rock
Felsic rock
Intermediate rock
Felsic rocks are light-colored igneous rocks rich in Silica and poor in Iron and
Magnesium a. b.
True _______________
False _______________
Basalt is a a. b
Mafic rock
Felsic rock c Intermediate rock
Intermediate rocks are a mixture of both mafic and felsic rocks a. b.
True _______________
False ______________

10
11.
12.
13.
16.
15.
14.
A rock with a vesicular texture indicates that the magma it formed from was a.
b.
Filled with gases
Rich in silica
Texture ) is used to identify plutonic igneous and volcanic igneous rocks a. True ____________ b.
False ____________
According to Bowen's reaction series, a felsic magma would not produce a basaltic rock when it solidifies a. b.
True _______________
False ______________ a. b
When a magma cools slowly it forms a fine-grained texture
True ______________
False _____________
When a magma cools rapidly it forms a coarse-grained texture a. b.
True _____________
False _____________
The slower a magma cools, the larger the crystals formed a. True ______________ b. False ______________
The texture of igneous rocks can be determined by these factors a. b. c. d.
Cooling rate of the magma
Amount of volatile present in the magma
Amount of iron and magnesium in the magma a and b

18.
17.
19.
23.
22.
21.
20.
Granite is an intrusive igneous rock formed from a a. b. c. d. a. b. c. d. e. a. b b. a. b. a. b.
Slowly cooling and crystallizing magma
Rapidly cooling and crystallizing magma
All of the above
None of the above
Basalt is a volcanic rock formed from a
Slowly cooling and crystallizing magma
Rapidly cooling and crystallizing magma
Slowly cooling first and then rapidly cooling magma
All of the above
None of the above
Porphyritic textures form when a magma cools slowly first and then rapidly
True ________________
False ________________
Basalt is a volcanic rock with a coarse-grained texture a. True _______________
False ______________
Granite is a plutonic rock with a fine-grained texture
True ______________
False ______________
Aphanitic texture is a texture with small crystals invisible to the naked eye
True _______________
False ______________
Obsidian is formed from______________ magma a. b.
Very fast cooling
Very slow cooling

24.
25.
26.
28.
29.
27. Differentiation a. b. c. d. e.
The sequence in which minerals crystallize in magma is called the Bowen's reaction series a. True ______________ b False _____________ a. b.
The first minerals to form when magma starts crystallizing at 1200C are a. b. c. d. e
Olivine and plagioclases
Quartz
Micas
Orthoclase
None of the above
The greater the water content (or volatile) in a magma, the lower the temperature of crystallization of that magma (or the melting point)
True _______________
False ______________
in magma means that
First minerals to crystallize settle out at the bottom
No minerals crystallize
Only one mineral crystallizes
All minerals crystallize at the same time
None of the above
What is the dominant igneous rock type in oceanic crust? a. b.
Granite
Basalt
Frost wedging is this type of weathering a. b. c. d. e.
Chemical weathering
Mechanical weathering
Soil sampling a and b
None of the above

34.
31.
32.
30.
35
36.
37.
Oxidation is this type of weathering a. b. c. d. e.
Chemical weathering
Mechanical weathering
Soil sampling a and b
None of the above
The optimum environment for chemical weathering is a. b. c. d. e.
Cold and dry climate
Wet and warm/hot climate
Hot and dry climate
All of the above
None of the above
The most resistant mineral to weathering is:
(Hint: igneous mineral that crystallizes first weather first, mineral that crystallizes last....) a. b. c. d. e.
Olivine
Quartz
Feldspar
Pyroxene
None of the above
The most important agent in chemical weathering is a. b.
c. d. e.
Wind
Water
Slope
Ice
None of the above
Exfoliation is the result of a type of mechanical weathering called a.
b.
c.
d.
e.
Frost wedging
Oxidation
Unloading
Thermal expansion
None of the above a. b. c. d.
The protolith of marble in contact metamorphism is
Granite
Limestone
Slate
Gneiss
Metamorphism created when a cold rock is intruded by a hot magma body is called a. b.
Regional metamorphism
Contact metamorphism

39.
40.
38.
41.
42.
43.
Regional metamorphic rocks do not exhibit foliations a. b.
True
False
Contact metamorphism involves ____ only a. b. c.
Temperature (Heat) mainly
Pressure mainly
Both temperature and pressure equally
Regional metamorphism involves only a. b. c.
Temperature (Heat)
Pressure a and b
Lithification means ________________ of loose sediment into a sedimentary rock a. b. c. d.
Weathering and erosion
Weathering, erosion, and compaction
Cementation and compaction
Erosion, cementation, and compaction
Sandstone is a_____________ sedimentary rock a. Chemical inorganic b. c.
Detrital
Chemical organic (biochemical) d. All of the above
Limestone is a _________________sedimentary rock a. b. c.
Chemical inorganic
Detrital
Chemical organic (biochemical) d. All of the above
45. According to Bowen's reaction series, which minerals cannot coexist in the same rock a. b.
c.
d.
Olivine and quartz
Feldspar and mica
Pyroxene and amphibole
Orthoclase and plagioclase

Bonus Questions (20%): Answer on the back of the scantron, please.
1. What type of magma would be prevalent at mid-ocean ridges (hint: ocean floor)? a. b. c.
Mafic (basaltic)
Felsic (granitic)
Andesitic (mix)
2. When magma cools slowly first, inside and completes the rest of its cooling rapidly outside the Earth crust, what would be the texture of the resulting rock? a. b. c.
Phaneritic
Porphyritic
Aphanitic
Which magma has higher silica content? 3. a.
b.
c.
Felsic (granitic)
Intermediate (andesitic)
Mafic (basaltic)
4. Which mineral is not a a. b. c. d.
Olivine
Pyroxene
Calcite
silicate
Potassium feldspar
?