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Agricultural Science
For my possible test next week.
22
Physics
9th Grade
10/18/2007

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Cards

Term
What is triangulation?
Definition
The technique used to find earthquakes.
Term
What is done in triangulation? 
Definition
Seismic stations are placed.  Each reports to the other how far away the earthquake is.
Term
Principles of uniformity
Definition
The processes occurring today on the Earth are the sam processes that have occurred throughout the planet's history.
Term
Principe of Superposition
Definition
In undisturbed rock layers, the older rocks beneath the younger rocks.
Term
Number of the Eras of the Earth
Definition
Three eons
Term
Establishment of relative rock age
Definition
Fossils/volcanic ash can help with relative date of rocks
Term
Radiometric dating
Definition
Radiometric dating can establish an approximate age.
Term
Proterozoic (time)
Definition
2.5 billion years ago to 570 million years ago.
Term
Proterozoic (events)
Definition
1st mountains formed
1st multicellular organisms
O2 appeared in atmosphere
Term
Phanerozoic (time)
Definition
570 million years ago to the present.
Term
Phanerozoic (number of parts)
Definition
Three
Term
Paleozoic (time)
Definition
570 million years ago to the 245 million years ago.
Term
Paleozoic (periods)
Definition
Permian, carboniferous, devonian, silurian, ordovician, cambrian
Term
Paleozoic Animals
Definition
Trilobites were extremely prevalent (extinct at the end of the ordovician).
Term
Paleozoic (Events)
Definition
The 1st land plants, trees, amphibians, insects, reptiles and conifers appeared. Pangea formed.
Term
Mesozoic (time)
Definition
245 million years ago to 65 million years ago.
Term
Mesozoic (periods)
Definition
Triassic, jurassic, cretaceous.
Term
Mesozoic (nickname)
Definition
"The age of the dinosaurs"
Term
Mesozoic (events)
Definition
Pangea began to break apart. First birds and mammals appeared.
Term
Name of first bird
Definition
Archeoptrix
Term
Cenozoic era (time)
Definition
65 million years ago to present.
Term
Cenozoic (animals)
Definition
Large modern mammals (including humans)
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