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Mead Hall


How long ago did Earth's environment begin to form 4.6 billion years ago
what is geology the study of earth's formation and structure
what allows us to understand the evolution of life on Earth evidence from rocks and fossils
who was the Danish anatomist who figured out that shark teeth were tonguestones Nicholas Steno
what is the "rock cycle" the process of rock formation and recycling
sedimentary rock sediments that are washed from the land and deposited on a horizontal layer
superposition layers of sedimentary rock that the lowest layers were the earliest to be deposited
Relative Dating a method of sequencing events in the order of which they happened
Paleontologist a scientist that studies fossils
Pangea an ancient supercontinent that broke apart to form today's continents in Permian era
cross-cutting relationships a vein of rock that cuts across the rock's layers is younger than the layers
inclusions pieces of rocks that are inside rocks
faunal succession fossils can be used to identify the relative age of layers of sedimentary rock
who theorized that the continents had been part of a great landmass Alfred Wegener
plate tectonics the theory how the continents move
lithospheric plates giant pieces of solid rock on Earth's surface, their movement cause the continents to move
how many lithospheric plates there are seven
what does the distribution of fossils tell us around the world that the continents were once joined
how do plate tectonics result in the formation of new species new species were formed when populations were geographically operated species were no longer able o interbreed, so species evolved different adaptations
geologic time scale a model of the history of life on earth,
eras are determined but the dominant life forms that were present at the time
periods smaller blocks within eras based on types of fossils found
ozone layer blocked harmful radiation from the sun, allowing life life to move out of the water and onto dry land
when did the first eukaryotic cells appear during the Precambrian era, about 2 billion years ago
Paleozoic era fossils include trilobites, snails, clams, and corals, fishes with backbones appeared, plants and air breathing animals began to populate the earth
Mesozoic era age of reptiles included Jurassic era, first birds appeared and then suddenly extinct
Cenozoic era is still on going mammals first appeared
Quaternary period the first modern humans appeared 40,000 years ago.
Masses extinctions periods of large-scale extinction
which era had the biggest mass extinction the paleozoic era, known as the Permian extinction, possibly by a massive volcano
Cretaceous-Tertiary extinction happened about 65 million years ago ending the Mesozoic era, many scientists believe a large asteroid hit the earth. The dinosaurs became extinct at this point
sixth mass extinction many species today have become extinct, mainly because of human impact, an example is the California condor
absolute dating a method of estimating the age of a rock sample in years
half-life the amount of time it takes for half of the unstable atoms in a sample to decay
radioactive decay the releasing of unstable atoms as strong forces begin to decay
Jurassic dinosaur
Tertiary wooly mammoth
Quaternary humans
precambrian archaebacteria
Devonian plants
silurian fishes with backbones
Created by: tbostwick



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