Quiz on Rock Overview and Igneous Rocks

Q1. Porphyritic texture forms from

A. initial rapid cooling then slow cooling of magma

B. initial slow cooling then rapid cooling of magma

C.extremely rapid cooling of magma

D. escape of gas bubbles during cooling of lava

Check your answer

Q2. During crystallization of a basaltic magma _____________ is the first mineral to crystallize.

A. olivine

B. pyroxene

C. plagioclase

D. quartz

Check your answer

Q3. How does water influence the formation of magma?

A. rocks with higher water content melt at higher temperatures
B. rocks with higher water content melt at lower temperatures
C. rocks with higher water content produce basaltic magma
D. rocks with higher water content produce rhyolitic magma

Check your answer

Q4. According to theory, if fractional crystallization occurs (e.g. by early-formed crystals settling to the bottom of the magma chamber)

A. the remaining magma becomes more mafic-rich
B. the remaining magma does not change in composition
C. the remaining magma becomes more rich in silica
D. the magma cools faster

Check your answer

Q5. A very large igneous intrusion, such as the one that forms the core of the Sierra-Nevada mountain range, is called a

A. sill

B. dike

C. stock

D. batholith

Check your answer

Q6. Obsidian, or volcanic glass forms by

a. lava cools so fast minerals can't crystallize
b. lava cools so fast minerals are very fine-grained
c. rock is shattered during an eruption
d. volcanic mudflow deposition

Check your answer

Q7. Extrusive igneous rocks have smaller crystals than intrusive igneous rocks because _______.

A. Intrusive igneous rocks cool slower than extrusive rocks
B. Extrusive igneous rocks cool slower than intrusive rocks
C. Intrusive igneous rocks melt slower than extrusive rocks
D. Extrusive igneous rocks melt slower than intrusive rocks

Check your answer

Q8. Most common rock-forming minerals are ______.

A. carbonates B. oxides C. silicates D. sulfides

Check your answer

Q9. What type of rocks form from the solidification of molten rock?

A. igneous B. mineralogic C. sedimentary D. metamorphic

Check your answer

Q10. What types of rocks form from pre-existing rocks that are subjected to high temperature and pressure?

A. igneous B. mineralogic C. sedimentary D. metamorphic

Check your answer

Q11. A basalt is an example of a(n) _______ rock.

A. igneous B. mineralogic C. sedimentary D. metamorphic

Check your answer

Q12. Which best describes basalt?

A. a foliated metamorphic rock
B. a non-foliated metamorphic rock
C. a coarse-grained light colored igneous rock
D. a fine-grained dark colored igneous rock

Check your answer

Q13. Clastic sediments form from _______.

A. rapid cooling of molten sediments
B. physically deposited particles of sediment
C. precipitation of sediments from sea water
D. accumulation of calcium carbonate shells

Check your answer

Q14. Limestone, a rock that forms from the shelly remains of organisms, is an example of a(n) _______.

A. extrusive igneous rock

B. intrusive igneous rock

C. clastic sedimentary rock

D. chemical sedimentary rock

Check your answer

Q15. An igneous rock that is coarse-grained and contains abundant quartz is _______.

A. granite

B. rhyolite

C. basalt

D. gabbro

Check your answer

Q16. Which of the following properties is diagnostic of a sedimentary rock?

A. layering B. foliation C. glassy texture D. orogeny

Check your answer

Answers

A1. Porphyritic texture forms from
a. initial rapid cooling of magma followed by slow cooling
b. initial slow cooling of magma followed by fast cooling
c. extremely rapid cooling of magma
d. escape of gas bubbles during cooling of lava

Answer: B

Go to next question

 

 

 

A2. During crystallization of a basaltic magma _____________ is the first mineral to crystallize.
a. olivine b. pyroxene c. plagioclase d. quartz

Answer: A, olivine

Go to next question

A3. How does water influence the formation of magma?
A. rocks with higher water content melt at higher temperatures
B. rocks with higher water content melt at lower temperatures
C. rocks with higher water content produce basaltic magma
D. rocks with higher water content produce rhyolitic magma

Answer: B

Go to next question

A4. According to theory, if fractional crystallization occurs (e.g. by early-formed crystals settling to the bottom of the magma chamber)
A. the remaining magma becomes more mafic-rich
B. the remaining magma does not change in composition
C. the remaining magma becomes more rich in silica
D. the magma cools faster

Answer: C

Go to next question

A5. A very large igneous intrusion, such as the one that forms the core of the Sierra-Nevada mountain range, is called a
a. sill b. dike c. stock d. batholith

Answer: D

Go to next question

A6. Obsidian, or volcanic glass forms by
A. lava cools so fast minerals can't crystallize

B. lava cools so fast minerals are very fine-grained
C. rock is shattered during an eruption
D. volcanic mudflow deposition

Answer: A

Go to next question

A7. Extrusive igneous rocks have smaller crystals than intrusive igneous rocks because _______.
A. Intrusive igneous rocks cool slower than extrusive rocks
B. Extrusive igneous rocks cool slower than intrusive rocks
C. Intrusive igneous rocks melt slower than extrusive rocks
D. Extrusive igneous rocks melt slower than intrusive rocks

Answer: A

Go to next question

A8. Most common rock-forming minerals are ______.
A. carbonates B. oxides C. silicates D. sulfides

Answer: C

Go to next question

A9. What type of rocks form from the solidification of molten rock?
A. igneous B. mineralogic C. sedimentary D. metamorphic

Answer: A

Go to next question

A10. What types of rocks form from pre-existing rocks that are subjected to high temperature and pressure?
A. igneous B. mineralogic C. sedimentary D. metamorphic

Answer: D

Go to next question

A11. A basalt is an example of a(n) _______ rock.
A. igneous B. mineralogic C. sedimentary D. metamorphic

Answer: A

Go to next question

A12. Which best describes basalt?
A. a foliated metamorphic rock
B. a non-foliated metamorphic rock
C. a coarse-grained light colored igneous rock
D. a fine-grained dark colored igneous rock

Answer: D

Go to next question

A13. Clastic sediments form from _______.
A. rapid cooling of molten sediments
B. physically deposited particles of sediment
C. precipitation of sediments from sea water
D. accumulation of calcium carbonate shells

Answer: B

Go to next question

A14. Limestone, a rock that forms from the shelly remains of organisms, is an example of a(n)
_______.
a. extrusive igneous rock b. intrusive igneous rock
c. clastic sedimentary rock d. chemical sedimentary rock

Answer: D

Go to next question

A15. An igneous rock that is coarse-grained and contains abundant quartz is _______.

A. granite

B. rhyolite

C. basalt

D. gabbro

Answer: A

Go to next question

A16. Which of the following properties is diagnostic of a sedimentary rock?
A. layering B. foliation C. glassy texture D. orogeny

Answer: A

That's the end of this quiz!

Go to GEO 100 Quiz Page

Go to GEO 100 Home Page