Earth Science chapter 12

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Lovelace

Which of the following gases was NOT
part of Earth's original atmosphere?
a. water vapor
b. carbon dioxide
c. nitrogen
d. oxygen
e. both a. and c.

D Oxygen

____________ are among the most wide
spread Paleozoic fossils.
a. Stromatolites
b. Birds
c. Dinosaurs
d. Salamanders
e. Brachiopods

E Brachiopods

As the solar system began forming, the first materials to condense into small particles were ________ and nickel.
A) oxygen
B) silicon
C) nitrogen
D) carbon
E) none of these

E none of these

Which one of the following represents the greatest expanse of geological time?
A) Mesozoic
B) Cenozoic
C) Precambrian
D) Paleozoic

C Precambrian

During the early Paleozoic era, South America, Africa, Australia, Antarctica, India, and perhaps China comprised the vast southern continent of ________.
A) Europe
B) Laurasia
C) Gondwanaland
D) Antindia
E) Pangaea

C Gondawanaland

Which type of bacteria thrive in environments that lack free oxygen?
A) aerobic
B) placental
C) anaerobic
D) foraminifera
E) photosynthetic

C anaerobic

Which era of geologic time spans about 88 percent of Earth's history?
A) Precambrian
B) Paleozoic
C) Mesozoic
D) Cenozoic
E) none of above

A Precambrian

The ________ means "the Sun in the making."
A) solar disk
B) presun
C) nebular Sun
D) sol
E) protosun

E protosun

Mammals became the dominant land animals during the ____era.
A) Pleistocene
B)Cenozoic
C)Cretaceous
D)Mesozoic
E)Paleozoic

B Cenozoic

The ____________ period was a time of major extinctions, including 75 percent of amphibian families.
a. Jurassic
b. Mississippian
c.Permian
d. Pennsylvanian
e. Devonian

C Permian

The beginning of the Cambrian Period marks an important event in animal evolution - the appearance of organisms with ____________.
a. wings
b. cells
c. hard parts
d. vertebrae
e. none of the above

C hard parts

The era of "ancient life" is the _________ era.
a.Cenozoic
b.Precambrian
c.Neolithic
d.Mesozoic
e.none of the above

E none of the above

Due to a virtual absence of land plants and certain animals, fossil fuels are notably absent in ____________ rocks.
a.Precambrian
b.Paleozoic
c.Mesozoic
d.Cenozoic
e.Paleozoic and Mesozoic

A Precambrian

he major source of free oxygen in the atmosphere is from ____________.
a.molten rock
b.water
c.green plants
d.silicate minerals
e.glaciers

C green plants

The age of Earth is about ____________.
a.2 billion years
b.4.5 million years
c.16 million years
d.4.5 billion years
e.195 million years

D 4.5 billion years

The Precambrian rock record indicates that much of Earth's first free oxygen combined with ____________ dissolved in water.
a.potassium
b.silicon
c. iron
d. carbon
e. none of these

C iron

Which one of the following does NOT characterize the early development and specialization of the primitive mammals?
a.increase in size
b.increase in stomach capacity
c.increase in brain capacity
d.specialization of limbs
e.specialization of teeth

B Increase in stomach capacity

As they formed, due to their high temperatures and comparatively weak gravitational fields, which planets were unable to retain appreciable amounts of hydrogen, helium, and ammonia?
a.Jupiter and Neptune
b.Mercury and Earth
c.Uranus and Pluto
d.Jupiter and Uranus
e.Neptune and Uranus

B Mercury and Earth

Abundant fossil evidence did not appear in the geologic record until about ________.
a.5 billion years ago
b.6 million years ago
c.550 million years ago
d.300 million years ago
e.3 billion years ago

C 540 million years ago

During the late Paleozoic, the present-day North America, Europe, western Asia, Siberia, and perhaps China formed the northern continent of ____________.
a.Gondwanaland
b.Laurasia
c.Greenland
d.Africa
e.none of the above

B Laurasia

Most ____________ rocks are devoid of fossils, which hinders correlation of rocks.
a.Precambrian
b.Paleozoic
c.Mesozoic
d.Cenozoic
e.Mesozoic and Cenozoic

A precambrian

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