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15
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How did Earth's oceans form?
As the atmosphere cooled, water vapor condensed into rain which fell and formed the oceans
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15
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What are eras subdivided into?
Periods
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monster
Reset all scores!
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seesaw
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fairy
Take points!
5
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15
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25
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baam
Lose 10 points!
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15
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What is the first major division of geologic time?
Precambrian time
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banana
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star
Double points!
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fairy
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25
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lifesaver
Give 10 points!
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15
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Why do geologists use the geologic time scale?
Because the time span of Earth's past is so great
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15
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What were the earliest multi-cellular organisms?
Invertebrates
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What gases composed the first atmosphere?
Light gases like hydrogen and helium
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What is a reptile?
A vertebrate that has scaly skin and lays eggs with tough, leathery shells
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How did scientists develop the geologic time scale?
By studying rock layers and index fossils
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What is an invertebrate?
An animal without a backbone
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What is a comet?
A ball of dust, gas, and ice that orbits the sun
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heart
Other team wins 20 points!
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seesaw
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gift
Win 5 points!
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lifesaver
Give 15 points!
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15
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What is the most recent period of geologic time?
The Quaternary Period
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What information do scientists infer from fossils?
How organisms and environments have changed over time
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15
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During which era did mammals evolve to live in many different environments?
Cenozoic
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