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- 1. Multiple Choice
An asteroid that impacted Earth about 66 million years ago is believed to be responsible for ____.
the creation of life on Earth
a global catastrophe that may have wiped out the dinosaurs
the splitting of one land mass into continents
the evolution of Earth’s oceans
- 2. Multiple Choice
The process of fossilization typically begins when an organism or traces of it ____.
settle on the seafloor
are pressurized under the weight of sediment
are saturated with groundwater
become covered with sediments, mud, or ash
- 3. Multiple Choice
____ are examples of trace fossils.
Shells
Footprints
Leaves
Skeletons
- 4. Multiple Choice
The geologic time scale is often subdivided on the basis of ____.
periods of mass extinction
the appearance of new species
levels of background extinction
climate change
- 5. Multiple Choice
Which statement about the geologic time scale is false?
Mammals originated early in the Mesozoic era.
Radiations of marine invertebrates took place in the Mesozoic era.
Mass extinction of the dinosaurs occurred about 65 million years ago.
Eukaryotes originated during the Proterozoic eon.
- 6. Multiple Choice
The Cretaceous is the most recent period of the ____ era.
Archaean
Cenozoic
Mesozoic
Proterozoic
- 7. Multiple Choice
Most fossils ____.
form without water
are impervious to erosion
contain remnants of soft body parts
are found in sedimentary layers of rock
- 8. Fill in the Blank
____________________ are evidence of life in the distant past.
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