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Earth History

Crust composed of igneous, metamorphic, &sedimentary rocks
Mantle silicate rocky shell with an average thickness of 2,856 kilometers
Outer core thick and composed of iron and nickel
Inner core solid ball made of metal
Theory of the Continental Drift States that parts of the Earth's crust slowly drift atop a liquid core
What was the name of the single continent involved in plate tectonics Africa
petrified fossils forms when minerals soak into the buried remains, replacing the remains, and changing them into rock
preserved fossils preserved remains of a prehistoric organism
trace fossil provides evidence of the activities of ancient of ancient organisms
Mold fossil a hollow area of a fossil
cast fossil copy of a fossil
index fossil only existed for a short period of time, easy to identify and small
Law of Superposition states that the oldest will be at the bottom
What kind of rock are fossils usually found? Sedimentary rock
Precambrian One of the 4 Geological ERA's. Began about 4.5 billion years ago and ended 543 million years ago. This started with the formation of Earth and ended at the first sign of complex life.
Paleozoic One of the 4 Geological ERA's. Ran from about 542 million years ago to 251 million years ago.
Permian One of the 4 Geological ERA's. Ended with the permian extinction.
Mesozoic One of the 4 Geological ERA's. started from about 245 million years ago to about 65 million years ago. Began with the largest mass extinction and ended with the asteroid that killed the dinosaurs.
Ice Cores cylinders of ice drilled out of an ice sheet or glacier.
Where can Ice Cores be found? Antarctica and Greenland
What can be learned from Ice Cores? They allow us to go back in time and to sample accumulation, air temperature and air chemistry from another time
Most important things we can learn from fossils how long life has existed on Earth and how different plants and animals are related to each other
Relative dating determining the relative order of past events
absolute dating determining an age on a specified time scale
Created by: 1076267722414972