Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
Fossils
| Question | Answer |
|---|---|
| Fossils | -Preserved remains or traces of animals, plants, and other organism from the remote past. |
| Sedimentary Rocks | -Formed in layers by the deposition of weathered rocks -Sediments are pressed and cemented together |
| Ammonites | -example of index fossils |
| Stromatolites | -Rock like structures built by blue-green algae -first forms of life on Earth - oldest known fossils (3.5 b.y.) -still found in some remote areas of the world today |
| Trace Fossil | -Provides indirect evidence of life in the past rather than the body of the animal itself |
| Index Fossil | -Special fossils called index fossils indicate o geologist the boundaries in geological time -This is a tool to determine the age of rock |
| Casts | -organism dies and the cavity fills with minerals maybe sand or clay |
| Molds | -organism dies and there is no filling of the cavity with minerals |
| Relative Age | -if two different rock strata in different areas on Earth contain the same index fossils then the strata are probably the same age |
| Absolute Age | -Most accurate form of dating also call radiometric dating -uses the decay of radioactive elements to find absolute age of a rock or fossil -This relies on the property of half life which is the predictable time an element takes to decay |
| Geologic Time Scale | -A chronological representation of Earth's geologic history going back 4.6 billion years until present day |
| Fossil Record | -History of life as documented by fossils -tells us when organisms live and how they changed over millions of years & and a clue to the environment -Recorded on the Geologic Time Scale |
| Coprolite | -Fossilized feces of animals that lived millions of years ago -Example of trace fossils |
| Permineralization | -Groundwater carries dissolved minerals into the pores and cavities of bone, wood or shells -the original material is preserved rather than replaced |
| Petrification | -Two types - replacement and permineralization -Both result in organic material converting into stone or a similar substance |
| Carbonization | -the process by which all substances of plants and animals decay, except carbon -this leaves a carbon film on the sedimentary rock |
| Law of Superposition | -Geologist assume the newest rock layers are on top of the older ones unless some type of disturbance occurs. |
| Burrows | -Examples of trace fossils |
| Paleontologist | -Someone who studies fossils |
| Fossil Resin | -resin is excreted from certain plants, which is thought to protect them from insects and seals off plant injuries -the sticky resin captures insects and other other invertebrates it hardens and they are preserved in the resin including their DNA |
| Replacement | -Happens when water dissolves the original solid material and replaces them with mineral matter such as calcite, silica, pyrite and hematite -Happens slowly |
| Tar & Ice | -An animal can become trapped in tar and the whole body can be preserved -Freezing can also trap whole animals Mammoth's bodies have been found with skin, hair and even organs |
| Fake Fossils | -Mineralized markings or objects that look like fossils but are actually just unusual formations in the rock |
| Micro-fossils | -Fossils of hard and soft parts that are too small to be observed by the naked eye |
Created by:
ischultz!
Popular Earth Science sets