1 Exampromax - Stuvia US 2025/2026
APSC 151 Midterm Questions and Answers
(100% Correct Answers) Already Graded A+
Question: Compared to the age of the Universe of about 14 billion years,
the currently accepted age of Earth is
about ________ years as determined by using radioactivity for dating rocks
and minerals.
© 2025 Assignment Expert
A) 4.6 thousand
B) 4.6 billion
Exampromax - Stuvia US
C) 5.4 million
D) 13.7 billion
⼀Answer: B
Question: The ________ division of the geologic time scale is an era of
the Phanerozoic Eon.
A) Paleocene
B) Paleozoic
C) Permian
D) Proterozoic
⼀Answer: B
Question: The Earth's core was formed from ________.
A) a massive nickel iron asteroid that was the nucleus upon which Earth
condensed
, 2 Exampromax - Stuvia US 2025/2026
B) high density radioactive carbon
C) the left over nickel and iron that would not fit into the earlier formed
crust and mantle
D) molten iron and nickel that separated from silicates and sank due to its
higher density
⼀Answer: D
© 2025 Assignment Expert
Question: Pangaea was ________.
Exampromax - Stuvia US
A) a large, ocean basin that opened in the Triassic and closed in the
Paleocene
B) a large, Precambrian shield area in Africa and South America that broke
apart late in the Proterozoic Eon
C) a huge mountain range that formed when Africa pushed northward into
Europe in Eocene time
D) a super continent that formed in the late Paleozoic and broke apart in
Triassic time
⼀Answer: D
Question: The oceanic crust is made of mafic rock called ________ and is
about ________ thick on average
A) basalt, 7 km
B) marine sedimentary rocks, 25 km
, 3 Exampromax - Stuvia US 2025/2026
C) basalt, 70 km
D) granite, 35-40 km
⼀Answer: A
Question: The composition of the upper mantle of Earth is thought to be
A) basalt
B) granite
C) peridotite
D) iron-nickel alloy
© 2025 Assignment Expert
⼀Answer: C
Exampromax - Stuvia US
Question: Which one of the following statements is not correct?
A) Metamorphic rocks may melt to magma.
B) Sedimentary rocks may weather to igneous rocks.
C) Magmas crystallize to form igneous rocks.
D) Igneous rocks can undergo metamorphism
⼀Answer: B
Question: ________ rocks form by crystallization and consolidation of
molten magma
A) Sedimentary
B) Indigenous
C) Primary
D) Igneous
⼀Answer: D
APSC 151 Midterm Questions and Answers
(100% Correct Answers) Already Graded A+
Question: Compared to the age of the Universe of about 14 billion years,
the currently accepted age of Earth is
about ________ years as determined by using radioactivity for dating rocks
and minerals.
© 2025 Assignment Expert
A) 4.6 thousand
B) 4.6 billion
Exampromax - Stuvia US
C) 5.4 million
D) 13.7 billion
⼀Answer: B
Question: The ________ division of the geologic time scale is an era of
the Phanerozoic Eon.
A) Paleocene
B) Paleozoic
C) Permian
D) Proterozoic
⼀Answer: B
Question: The Earth's core was formed from ________.
A) a massive nickel iron asteroid that was the nucleus upon which Earth
condensed
, 2 Exampromax - Stuvia US 2025/2026
B) high density radioactive carbon
C) the left over nickel and iron that would not fit into the earlier formed
crust and mantle
D) molten iron and nickel that separated from silicates and sank due to its
higher density
⼀Answer: D
© 2025 Assignment Expert
Question: Pangaea was ________.
Exampromax - Stuvia US
A) a large, ocean basin that opened in the Triassic and closed in the
Paleocene
B) a large, Precambrian shield area in Africa and South America that broke
apart late in the Proterozoic Eon
C) a huge mountain range that formed when Africa pushed northward into
Europe in Eocene time
D) a super continent that formed in the late Paleozoic and broke apart in
Triassic time
⼀Answer: D
Question: The oceanic crust is made of mafic rock called ________ and is
about ________ thick on average
A) basalt, 7 km
B) marine sedimentary rocks, 25 km
, 3 Exampromax - Stuvia US 2025/2026
C) basalt, 70 km
D) granite, 35-40 km
⼀Answer: A
Question: The composition of the upper mantle of Earth is thought to be
A) basalt
B) granite
C) peridotite
D) iron-nickel alloy
© 2025 Assignment Expert
⼀Answer: C
Exampromax - Stuvia US
Question: Which one of the following statements is not correct?
A) Metamorphic rocks may melt to magma.
B) Sedimentary rocks may weather to igneous rocks.
C) Magmas crystallize to form igneous rocks.
D) Igneous rocks can undergo metamorphism
⼀Answer: B
Question: ________ rocks form by crystallization and consolidation of
molten magma
A) Sedimentary
B) Indigenous
C) Primary
D) Igneous
⼀Answer: D
