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What principle is one of the cornerstones of geology, based on the premise that present-day processes have operated throughout geologic time?
What principle is one of the cornerstones of geology, based on the premise that present-day processes have operated throughout geologic time?
How have geologists been able to assign ages in years to the subdivisions of the geologic time scale?
How have geologists been able to assign ages in years to the subdivisions of the geologic time scale?
What resulted from the work of many 19th-century geologists who pieced together information from numerous rock exposures?
What resulted from the work of many 19th-century geologists who pieced together information from numerous rock exposures?
What principle allows us to use present-day processes as the basis for interpreting the past and predicting potential future events?
What principle allows us to use present-day processes as the basis for interpreting the past and predicting potential future events?
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What did Hubble observe about the velocity of galaxies moving away from Earth?
What did Hubble observe about the velocity of galaxies moving away from Earth?
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What larger cycle has resulted in numerous glacial advances and retreats during the past 1.8 million years?
What larger cycle has resulted in numerous glacial advances and retreats during the past 1.8 million years?
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Which geological era is characterized by the appearance of life in the oceans and the colonization of land by plants and fungi?
Which geological era is characterized by the appearance of life in the oceans and the colonization of land by plants and fungi?
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How does the Doppler effect relate to the observed redshift in the spectral lines of galaxies?
How does the Doppler effect relate to the observed redshift in the spectral lines of galaxies?
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Which period on the Geologic Time Scale is known for the extinction of dinosaurs and the rise of mammals?
Which period on the Geologic Time Scale is known for the extinction of dinosaurs and the rise of mammals?
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What is the analogy used in the text to explain how galaxies move apart from each other?
What is the analogy used in the text to explain how galaxies move apart from each other?
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What process occurs when stars undergo nuclear reactions?
What process occurs when stars undergo nuclear reactions?
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Based on the text, what happens to the velocity between galaxies as their distance increases?
Based on the text, what happens to the velocity between galaxies as their distance increases?
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What happens to the composition of the universe over time?
What happens to the composition of the universe over time?
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How does the motion of raisins in a rising loaf of bread relate to the expanding universe?
How does the motion of raisins in a rising loaf of bread relate to the expanding universe?
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What is the term used for Earth's earliest eon, encompassing the time from Earth’s formation to around 4 billion years ago?
What is the term used for Earth's earliest eon, encompassing the time from Earth’s formation to around 4 billion years ago?
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What is the estimated composition of the universe when it is one trillion years old?
What is the estimated composition of the universe when it is one trillion years old?
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Which combination of layers form plates?
Which combination of layers form plates?
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What is a scientific theory based on?
What is a scientific theory based on?
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What phenomenon is thought to result in plate movement?
What phenomenon is thought to result in plate movement?
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What led scientists to conclude the occurrence of the Big Bang approximately 14 billion years ago?
What led scientists to conclude the occurrence of the Big Bang approximately 14 billion years ago?
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