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Unit 2 Test
Unit 2 Test
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Earth's History
Flashcards
20 cards
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Practice quiz
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Questions
20
Answers
1
Under which of the following conditions would a fossil
most likely
form?
cast fossil
A living thing dies and sediment quickly covers its body
mold fossil
saltwater croc
2
Which of the following events occurred during the Mesozoic era?
Fishes appeared
Reptiles evolved on land.
Dinosaurs became common on land.
Whales and dolphins evolved in the oceans.
3
What is endangered species?
ecosystems
destruction of habitats.
those whose populations have been threatened to extinction.
increased human population
4
why geologists use the geologic time scale to show Earth’s history?
Cenozoic
for the definition of geologic time
to organize events in Earth’s long history
to tell stories
5
consulting the geologic time scale for when the 1st vertebrates evolved, where would you look?
The cenozoic era
the section for Precambrian time
in the section for Ordovician period of the Paleozoic era
the section for the Triassic period of the Mesozoic era
6
Define the geologic time scale
absolute age of rock samples
Time in motion
the geologic time scale is a record of the geologic events.
age of rock layers
7
Which of the following organisms is
not
extinct?
the dodo bird
the Carolina parakeet
the saber-toothed tiger
the saltwater crocodile
8
Earth’s atmosphere, oceans, & continents began to form during the 1st hundred million years of
the Paleozoic era.
the Cenozoic era.
Precambrian time.
the Mesozoic era.
9
During which section of the geologic time scale did the first modern humans evolve?
during the Paleogene period of the Cenozoic era
during Precambrian time
during the Quaternary period of the Cenozoic era
Paleozoic era
10
What is an unconformity?
An unconformity is a gap in the geologic record.
fossil index
rock formation
bottom layers
11
What is carbon sink?
Something that takes the excess CO2 from the atmosphere.
The carbon cycle
the water cycle
becoming extinct
12
an example of a trace fossil,
reptile
dinosaur teeth
footprints and trails
chicken foot
13
What does the law of superposition tell about the relative ages of rocks?
Layers, layers, layers
the deeper you go into rock layers, the older the rocks are
the oldest rock layer is always undisturbed
the deeper you go into rock layers, the younger the rocks
14
a rock layer is eroded, which additional event must occur to create an unconformity?
radioactive decay along a fault
a volcanic eruption near the eroded area
new sediment deposits build up on the eroded area
earthquakes
15
True/False: two fossils of different species, must have lived during the same time period.
rock fossils
They are made of rocks
false
True because they buried next to each other in a rock layer,
16
What is the half-life of strontium-90?
Carbon-14 is a radioactive isotope
date rocks and fossils.
time it takes for half of the radioactive atoms to decay.
proportion of radioactive atoms
17
Which of the following vertebrates had become abundant after the dinosaurs became extinct?
mammals
Dodo bird
woolly mammoths
reptiles
18
A species might become extinct when a disastrous event, such as a meteorite impact, occurs.
Earthquakes occurs
False
nada
True
19
Radioactive decay occurs when atoms
are exposed to chemical weathering.
lose mass.
atoms start dancing
break down to form atoms of another element.
20
In the Devonian period, animals
could live on land & in water.
What were they called?
reptiles
amphibians
dinosaurs
Birds
