Earth History Crossword Puzzle

QUESTIONS LIST:

• devonian: numerous fishes, other sea life; many plants, first trees; wingless insects
• paleozoic: oldest era; organisms developed hard parts
• evolution: the process of change that produces new life forms over time
• stone age: prehistoric period during which stone was widely used
• era: a major division of geologic time
• archean: formation of oceans, atmosphere, and continents; bacteria
• permian: largest extinction in earth's history
• jurassic: many sea reptiles;early large dinosaurs; later,flying reptiles, and earliest known birds
• cenozoic: relating or denoting to the most recent era
• cretaceous: period characterized by the greatest development, rise of modern insects and flowering plants
• reptile: a cold-blooded vertebrate including snakes and lizards
• precambrian: all the geologic time before the start of the cambrian period in the paleozoic era.
• eon: period in earth's history
• geology: science of the history of the earth as recorded in rocks
• ordovician: diverse marine life, including vertebrates; vascular plants
• mesozoic: era comprising of the triassic, jurassic, and cretaceous periods
• dinosaur: an extinct terrestrial reptile of the mesozoic era
• periods: subdivisions of eras