Quiz 2: Question Preview (ID: 27776)

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Which of the following shows the eras in order from oldest to most current?
a) Paleozoic, Pre-Cambrian, Mesozoic, Cenozoic
b) Pre-Cambrian, Paleozoic, Mesozoic, Cenozoic
c) Cenozoic, Mesozoic, Paleozoic, PreCambrian
d) Cenozoic, Mesozoic, Pre-Cambrian, Paleozoic

The Cenozoic Era is often called the Age of
a) Fishes
b) Reptiles
c) Amphibians
d) Mammals

The Paleozoic, Mesozoic, and Cenozoic are divisions in the geologic time scale called
a) epochs
b) periods
c) layers
d) eras

The geologic time scale is a record of
a) the thickness of sedimentary rock layers
b) the rate of fossil formation
c) the life forms and geologic events in Earth's history
d) the time since the evolution of dinosaurs

Radioactive decay occurs when atoms of an unstable element
a) become part of a fossil
b) join with atoms of another element
c) break down to form atoms of another element
d) are exposed to chemical weathering

Which type(s) of rock can experience heat and pressure?
a) igneous
b) sedimentary
c) metamorphic
d) all of the above

The relative age of a rock is
a) its age compared to the ages of other rocks
b) less than the age of the fossils the rock contains
c) the number of years since the rock formed
d) its age based on how much carbon-14 the rock contains

The law of superposition states that, in horizontal layers of sedimentary rock, each layer is
a) younger than the layer above it and older than the layer below it
b) neither older nor younger than the other layers
c) older than the layer above it and younger than the layer below it
d) always older than any vertical layers

Rocks worn down by rain and wind can change any rock into
a) chemical rock
b) gemstones
c) metamorphic rock
d) sedimentary rock

The fossils of organisms that were widely distributed but only lived during a short period of time are called
a) trace fossils
b) petrified fossils
c) index fossils
d) carbon film fossils

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