Science chapters 15-16
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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What 3 things do fossils tell us? | 1. relative history2. environment3. way organisms lived
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Name 3 conditions that support fossil development... | 1. hard bones2. quick bury3. preserved over a long time
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Describe how petrification occurs... | proccess in which minerals replace organisms tissues
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How do index fossils work... | you look at one fossil and then use it to see if another fossil is older or younger than it.
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What does extinct mean? | no more of a certain species alive
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What 2 hypotheses were discussed about landform evoulution? | 1. catastrophism2. uniformitarism
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Describe the principle of superposition... | younger rocks on top of older rocks
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What is relative dating... | estamating if the rock is older or younger than the rock saround it
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Describe the 3 unconformities... | 1. disconformity2. nonconformity3. angular unconformity
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What elements have half-lifes... | radio-active material
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What is half-life... | time it takes for half the radio-acrive material to decay
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What happens to parent and daughter materials during radio-active decay... | p- smallerd- larger
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What are the 5 main subdivisions of geological time scale? | eonera periodepochages
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Phanerozoic | PaleozoicMesozoicCenozoic
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Paleozoic | fish
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Mesozoic | dinosaurs
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Cenozoic | mammals
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What are cyanobacteria? | 1st known life 3.5 billion years ago
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What affects survival? | predators, food, shelter, and climate
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Natural selection... | The species/animal with a better trait lives while the others die
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5 things fossils can be preserved in are... | 1. amber2. ice3. asphault4. sediment (rock)5. petrification
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uniformitarianism | the events that happend in the past will happen again in the future
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catastrophism | bad event
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paleontology | study of the past using fossils
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superposition | the younger layers on top and the older are on the bottom
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unconformity | break in geological layers
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fault | fracture in layers
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tilting |
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intrusion | when magma goes through layers of existing rocks.
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folding | when a layer of rock bends
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disconformity | layer of rock is missing
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non-conformities | when layer of rock forms on top of a layer of pre-existing magma
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angular unconformities | a layer of horizontal sediment is deposited on top of tilted layers of sediment
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isotope | same number of protons and different nuetrons
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half-life | the time it takes for half of the parent material to decay
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trace-fossil | impressions such as footprints that are preserved from the past
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mold | outer part of something
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cast | mold filled
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ammonites | really good species of index fossils
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trilobites | Paleozoic time like snails (anthropods)
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Or sort by any of the columns using the down arrow next to any column heading.
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