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29 Cards in this Set
- Front
- Back
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atom
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the smallest particle of an element
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element
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a substance in which all the atoms are the same that cannot be broken down into other substances
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radioactive decay
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the breakdown of a radioactive element, releasing particles and energy
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half-life
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the time it takes for half of the atoms of a radioactive element to decay
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geologic time scale
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a record of the geologic events and life forms in Earth's history
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era
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one of the three long units of geologic time between the precambrian and the present
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period
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one of the units of geologic time into which geologists divide eras
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comet
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a loose collection of ice, dust and small-rocky particles, typically with a long, narrow orbit of the sun
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continental drift
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the hypothesis that the continents slowly move across Earth's surface
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invertebrate
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an animal with a backbone
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amphibian
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a vertebrate that lives part of it's life on land and part of it's life in water
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reptile
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a vertebrate with scaly skin that lays eggs with tough leathery shells
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mass extinction
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when many types of living thins become extinct at the same time
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mammal
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a warm-blooded vertebrate that feeds its young milk
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atom
|
the smallest particle of an element
|
|
|
element
|
a substance in which all the atoms are the same that cannot be broken down into other substances
|
|
|
radioactive decay
|
the breakdown of a radioactive element, releasing particles and energy
|
|
|
half-life
|
the time it takes for half of the atoms of a radioactive element to decay
|
|
|
geologic time scale
|
a record of the geologic events and life forms in Earth's history
|
|
|
era
|
one of the three long units of geologic time between the precambrian and the present
|
|
|
period
|
one of the units of geologic time into which geologists divide eras
|
|
|
comet
|
a loose collection of ice, dust and small-rocky particles, typically with a long, narrow orbit of the sun
|
|
|
continental drift
|
the hypothesis that the continents slowly move across Earth's surface
|
|
|
invertebrate
|
an animal with a backbone
|
|
|
amphibian
|
a vertebrate that lives part of it's life on land and part of it's life in water
|
|
|
reptile
|
a vertebrate with scaly skin that lays eggs with tough leathery shells
|
|
|
mass extinction
|
when many types of living thins become extinct at the same time
|
|
|
mammal
|
a warm-blooded vertebrate that feeds its young milk
|
|
|
vertebrate
|
an animal with a backbone
|
