Popular in Principles of Geology
Popular in Geology
This 2 page Class Notes was uploaded by Taylor sandeno on Monday September 28, 2015. The Class Notes belongs to Geo 102 at Illinois State University taught by Bill Shields in Fall 2015. Since its upload, it has received 36 views. For similar materials see Principles of Geology in Geology at Illinois State University.
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Date Created: 09/28/15
921 rocky and metallic objects that orbit the sun but are too small to be considered planets They are known as minor planets Anything from the size of a grain of sand in space to the size of 1000 kilometers past Mars and before Jupiter distance between the sun and Earth distance between moon and Earth formed as the solar system formed and were thrown to the outside of it They live in the Oort Cloud They are small fragile irregularly shaped bodies composed of a mixture of nonvolatile grains and frozen gases space dust or debris which produces spectacular light as it collides with Earth s atmosphere range in size from mg to kg those which reach ground are called meteorites I Chicxulub in the Yucatan Peninsula killed the dinosaurs Icaused the largest amout of Basalt that ever existed Tertiary Mass Extinction event Earth in Time The Rock Record and Geologic Time 46 billion years old 137 billion years old how long ago the big bang happened Followed by Era Paleozoic Mesozoic Cenozoic Paleo ancient mesomiddle cenorecent Smallest time division and one we live in now a manmade concept Not real We can see back in the past all the way to 3000 years past the big bang 923 differently than most people Our concept of eternity is the amount of years we were alive Geologists think of 10000 years as not a lot of time 2 types The age of a rock fossil or other feature measured relative to another Putting earth material and events in order without knowing how old they are numerical dating The age of a rock in years Knowing how old things are when you put them in order Geologic Processes operating today are similar to those that have operated throughout Earth s history The present is the key to the past fancy words Stratum Strata Stratigraphy Earth layers are deposited in horizontal layers In a sequence of rocks the youngest rocks are on top and the oldest are on the bottom layer of missing time The place where erosion happened on the surface of the Earth a rock layer is always older than a feature that cuts through it The layer that does the cutting is younger If a rock fragment is found within another rock type the fragment is older Absolute DatingJ FMAMJJASON DJ 925 Bishop Usher Biblical Interpretation 4004 BC before the birth of Christ October 21 spontaneous transformation of an element to another isotope of the same element or another element positively charged no charge negatively charged element with different number of neutrons in the nucleus loss of a positively charged He ion neutron splits into proton and electron The xed period of time during which half the parent atoms present in a closed system decay to form daughter atoms