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25 Cards in this Set
- Front
- Back
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Balboa
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First European explorer to see the Pacific Ocean
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Eratosthenes
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First determination of Earth's circumference
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Magellan
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led voyage that first circumnavigated the globe
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Ptolemy
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mapped world with Roman knowledge showing latitude and longitude
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Vikings
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established temporary settlements in North America
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iron and nickel, liquid outer layer, solid inner layer
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core
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basalt and granite, outermost portion of the Earth
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crust
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milky way
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galaxy
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rich in ferromagnesian minerals, between crust and core
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mantle
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gaseous and dusty space cloud
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nebula
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Did not travel within sight of land
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Early Polynesians
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Earth's crust solidified around _________ years ago
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4.5 billion
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What happened when Earth cooled?
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the layers of the earth separated on basis of density differences
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Earth developed first ocean by about 4 million years ago
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False
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The mantle..
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produced enough water to fill the oceans
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Carbon dating
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determined age of rock or fossil
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Correct arrangement of astronomical bodies from oldest to youngest
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galaxy, solar system, planet
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All bodies in the solar system formed from an enormous gas cloud
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nebular hypothesis
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The separation of Earth into layers was the result of
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differing densities of the rock and mineral materials
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Oceanic crust is primarily
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basalt
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_____ crust is thicker and less dense than _______ crust
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Continental, oceanic
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Earth's early atmosphere included
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hydrogen, carbon dioxide, and water vapor
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Free oxygen is important because...
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can form ozone and block some UV radiation
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Heterotrophic organisms
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break down organic molecules produced by other organisms to release energy
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Radioactive isotopes
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determine the absolute age of the rock
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