Page 3 Vocabulary
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| relative age dating | places events in sequence without assigning an exact numerical age. Says Rock A is older than Rock B
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| absolute age dating | Places a numerical age to an event. This Cheseapeake Bay Bolide hit earth 60 million years ago is an example of this type of dating process
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| half-life | time it takes half of a radioactive material to turn non-radioactive. helpts to determine an absolute age of things
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| fossil | remains, impressions or other evidence of a former existance of life
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| marine | Virginia fossils are of this type of organism
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| era | 4 of these large units of geologic time makes up earth history. The precambrian, paleozoic, mesozoic and cenozoic are all geologic ______
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| period | A subdivision of an Era. Triassic, Jurassic and Cretacious are all these of the Mesozoic Era
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| PreCambrian Era | The longes Era of Earth History. occupies almost 90% of earth History. The ange of single celled life.
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| Mesozoic Era | Age of the dinosaurs. ended with an large impact from a comet or asteroid
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| Paleozoic Era | Age of the fish or marine life. A great dying or extinction marked the end of the era
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| Cenozoic | Age of the mammals and humans. the current geologic era.
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| seamount | an underwater volcanic mountain
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| abyssal plain | smoothflat horizontal ocean floor with thick sediments
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| delta | sediments deposited at the mouth of a river as the river slows in velocity
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| meander | twisted loops and turns in a mature river
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| glacial | relating to the ice ages or advance of ice during earth history. slow moving
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| soil profile | soil layers from the surface to the solid rock layere undeerneath
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| A horizon | rock sediments mixed with organic material; also called topsoil
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| humus | the dark organic material found in the A horizon or topsoils
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| B Horizon | rock sediments with out humus. made of clay usuall tan/red or light brown
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| C horizon | slightly weathered parent rock
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| Bedrock | unweathered rock layer below the soil
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| water table | top of the zone of saturation
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| cone of depression | the lowering fo the water table due to pulling water from a well faster than it can be replaced.
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| Physical (mechanical) weathering | disntegration of rock material. Rock is split into smaller pieces. No change in composition
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| Chemical weathering | decomposition. minerals of rocks are changed into different substances.
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| mature soil | soil with a very thick A- horizon
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| salintiy | the amount of dissolved materials found in ocean water
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| focus | point in the earth where movement occurs along a fault.
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| epicenter | point on the earth's surface directly above the focus of an earthquake
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| 32x | each whole number increase of earthquake strength means it is ______ times stronger. A magnitude 6 earthquake is ___ times stronger than a magnitude 5 earthquake
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| P- waves | fastest moving earthquake waves tht can travel thru solids and liquids
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| S- waves | slower moving earthquake waves that cannot pass through a liquid
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| Inner core | layer of the earth that is very hot and SOLID due to the extreme pressure and gravity. made of iron and nickle
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| Outter Core | The area of the core that is liquid. S-waves from earthquakes do not pass thru this layer.
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| mantle | area of the earth where convection occurs to push the plates
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| land breeze | hot land heats the air during the day creating rising air. Cooler air moves from the water toward the land creating this breeze
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| Big Bang | The Scientific theory that states that the universe began in a very hot, dense state that expanded and eventuallycondensed into galaxies.
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| CFC | The man-made gas that when released into the atmopshere willdestroy ozone creating the Ozone Hole
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Review the information in the table. When you are ready to quiz yourself you can hide individual columns or the entire table. Then you can click on the empty cells to reveal the answer. Try to recall what will be displayed before clicking the empty cell.
To hide a column, click on the column name.
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You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
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