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When 68-year-old Mrs.Blake had a flat tire on a fairly isolated highway,she received help from a passerby in less than 10 minutes.One year later,when she had a flat tire on a busy freeway,an hour elapsed before someone finally stopped to offer assistance.Mrs.Blake's experience best illustrates
Isotopes
Variations of a chemical element that have the same number of protons but different numbers of neutrons in their nuclei.
Ancient Rock
Rock formations dating back millions of years, often providing information on the Earth's geological and evolutionary history.
Prehistoric Cultural Sites
Locations that provide archaeological evidence of human activity and habitation before recorded history or the advent of written language.
Recent Lava Flows
Molten rock that has erupted from a volcano and solidified on the earth's surface in the recent geological past.
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