Chap. 20 w/s

Chapter 20 Worksheet 
Directions: Match each term in Column I with its definition in Column II. Write the letter of the correct definition
in the blank at left.
Column I
1. mineral
2. cleavage
3. fracture
4. hardness
5. streak
6. magma
7. rock
8. texture
9. intrusive igneous rock
10. extrusive igneous rock
11. crust
12. luster
13. streak test
14. crystal systems
15. silicates
Column II
a. a smooth, flat break in a mineral
b. outermost layer of Earth
c. cubic, hexagonal, tetragonal,
orthorhombic, mooclinic, and triclinic
d. size and arrangement of rock
components
e. the way a mineral reflects light
f. an inorganic solid with a crystalline
structure
g. color in powdered form
h. lava rock on Earth’s surface
i. molten rock
j. resistance to scratching
k. rock beneath Earth’s crust
l. an uneven break in a mineral
m. most important mineral group by
volume of Earth’s crust
n. a mixture of minerals, rock fragments,
or volcanic glass
o. performed by rubbing a mineral on
white porcelain tile
Directions: Using complete sentences, write the answer to the following question on the lines provided.
1. How do sedimentary rocks and metamorphic rocks differ?
Directions: Fill in the blanks using the correct terms from the list below.
clasts porosity cementation foliated rock cycle
2. With the possible exception of clay, all sedimentary rocks start off with some
______________________.
3. Small bits and pieces of minerals are called ______________________.
4. ______________________ is the process by which minerals precipitate out of
water to fill the space between clasts.
5. Mica is an example of a ______________________ rock.
6. The ______________________ includes any chemical and physical conditions
that continuously form and change rocks.
Directions: Place a plus (+) to the left of the statements that agree with the text. Place a minus
(-) to the left of the statements that do not.
7. Rocks inside Earth are protected from surface conditions.
8. Most of the time, both compaction and cementation work together to
form metamorphic rock.
9. In order of decreasing size, clasts are known as clay, silt, sand, and gravel.
10. Clast size provides a clue about the environment in which a rock formed.
Directions: Unscramble the terms in italics to complete the sentences below. Write the terms on the lines
provided.
1. A mineral is an inorganic solid with a perlebdaitc chemical
composition.
2. Mineral identification depends on careful noobistearv of its
physical properties.
3. Minerals cerzyisltla mainly from fluids and molten rock.
4. The composition and etreuxt of a rock indicate how it formed.
5. The intrusive rock granite is a model rock that describes the
mineral content of cloantinnet crust.
6. Coicnae crust is composed primarily of the extrusive igneous
rock basalt.
7. The texture of a porphyritic eatnidse can indicate its cooling
history.
8. Detrital syerdaitmne rocks can be composed of a wide variety
of clasts.
9. Biochemical sedimentary rocks form from the remains of
somrsgian.
10. Clast size affects its movement within a gtnriatnrsop medium.
11. Metamorphic rocks can form from any pgrneietxsi rocks.
12. Agents of mmsseithaporo can cause new textures and new
minerals to form.
13. Metamorphic rocks are diediefnit based on mineral
composition and texture.