Section #: 22.2
Formation of the Crust and Continents
Practice Test
1.
Minerals with low densities crystallize from a magma at __________ denser minerals do.
a.
hotter temperatures than
b.
always 10 degrees less than
c.
the same temperature as
d.
cooler temperatures than
Hint
2.
Why is the age of a zircon grain older than the age of the sandstone that it was found in?
a.
It is much less stable than the sandstone.
b.
because of the principle of superposition
c.
because of the principle of included fragments
d.
It is much more stable than the sandstone.
Hint
3.
What is the name of the Precambrian shield in North America?
a.
the Proterozoic Shield
b.
the Northern Shield
c.
the Archean Shield
d.
the Canadian Shield
Hint
4.
What is the name of the first supercontinent?
a.
Laurentia
b.
Rodinia
c.
Pangaea
d.
Baltica
Hint
5.
What was the composition of Earth's first crust?
a.
feldspar, quartz, and mica
b.
iron- and magnesium-rich minerals
c.
feldspar
d.
iron and quartz
Hint
6.
What supercontinent is shown in the figure?
a.
Pangaea
b.
Rodinia
c.
Laurentia
d.
Gondwana
Hint
7.
What continent existed around 1.8 billion years ago that now forms the core of modern North America?
a.
Pangaea
b.
Rodinia
c.
Laurentia
d.
North America
Hint
8.
The inner and outer core, mantle, and crust of Earth all have __________.
a.
different densities
b.
the same densities
c.
have the same specific gravity
d.
been rigid since the formation of Earth
Hint
9.
According to the map, which areas of North America were most affected by the formation of the Canadian Shield?
a.
the Pacific Coast
b.
Alaska
c.
the Midwest
d.
the Southwest
Hint
10.
What are areas called that contain cores of Archean and Proterozoic rock?
a.
Canadian shields
b.
Precambrian shields
c.
continental crust
d.
Archean shields
Hint
11.
How are microcontinents fused together?
a.
by seams called faults
b.
by seams called orogens
c.
by molten rock
d.
the erosion of mountains
Hint
