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.
A) 4.6 thousand
B) 4.6 billion
C) 5.4 million
D) 13.7 billion
✓✓✓✓~ B
The ________ division of the geologic time scale is an era of the Phanerozoic
Eon.
,A) Paleocene
B) Paleozoic
C) Permian
D) Proterozoic
✓✓✓✓~ B
The Earth's core was formed from ________.
A) a massive nickel iron asteroid that was the nucleus upon which Earth
condensed
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
,✓✓✓✓~ D
Pangaea was ________.
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
✓✓✓✓~ D
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
C) basalt, 70 km
D) granite, 35-40 km
✓✓✓✓~ A
The composition of the upper mantle of Earth is thought to be
A) basalt
B) granite
C) peridotite
D) iron-nickel alloy
✓✓✓✓~ C
Which one of the following statements is not correct?
A) Metamorphic rocks may melt to magma.
B) Sedimentary rocks may weather to igneous rocks.
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