Details Title: Agricultural Science Description: For my possible test next week. Total Flash Cards: 22 Created: 10/18/2007 22:31:03		New Users: To study from this flashcard set, or to create your own your own study flash cards, REGISTER HERE. Existing Users: CLICK HERE. Additional Physics Flashcards
Cards in this set: 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)