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Earth's History

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  • Which era is known as the "Explosion of Life" because of the many species that evolved including fish and other life forms?
    Paleozoic
  • What modern day animal do scientists believe evolved from dinosaurs?
    birds/chickens
  • Process by which all the different kinds of living things have changed over time
    evolution
  • Subdivisions of periods in geologic time
    epochs
  • The single landmass that broke apart 225 million years ago and gave rise to today’s continents
    Pangaea
  • How did the Cenozoic Era end?
    Era isn't over
  • Process by which plants use water, carbon dioxide and energy from the sun to make food
    photosynthesis
  • Animal that is warm blooded, has fur or hair and produces milk through glands for their young
    mammal
  • Animal that lives part of its life on land and part of its life in water
    amphibian
  • Which Era ended in a mass extinction caused by an asteroid, depleting the dinosaur species?
    Mesozoic
  • A record of the geologic events and life forms in Earth’s history
    geologic time scale
  • Animals that do not have a backbone
    invertebrate
  • Which Era did sea invertebrates evolve and make up majority of the animal population?
    Paleozoic
  • Animals that have a backbone
    vertebrate
  • How did the Paleozoic Era end?
    climate change
  • The first Era of Geologic Time ; “ancient life”
    Paleozoic
  • Known as the “middle era”
    Mesozoic
  • One of the units of geologic time into which eras are divided
    periods
  • Describes an organism that no longer exists anywhere on Earth
    extinct
  • One of the three long units of geologic time
    eras
  • The current era in which we live in; “recent life”
    Cenozoic
  • Dominant species in the Mesozoic Era; evolved from reptiles
    dinosaurs
  • Which Era did mammals and flowers appear?
    Mesozoic
  • Animals that have scaly skin and lay eggs
    reptiles
  • Period of time that marks the beginning of Earth’s history
    Precambrian Time
  • How did the Mesozoic Era end?
    asteroid hitting Earth and/or volcanic activity
  • Which Era did Homo sapiens evolve and dominate the world?
    Cenozoic
  • How old is Earth from when it started its history from the Precambrian Time?
    4.6 billion years old
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