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
unit 4 mreview
unit 4 midterm review
| Question | Answer |
|---|---|
| interpret the geologic time scale | |
| what are the time spans of the geologic time called? | periods, eras, eons |
| know the major milestones in geologic history. | |
| how are the principles of cross cutting relationships, original horizontality, inclusions and superposition used to find the relative age of rocks? | |
| interpret the sequence of events in geologic puzzles./ | |
| what are unconformities? | a layer between rocks that represents missing time; either deposition stopped or the rocks were eroded; this is shown by a black wavy line. |
| uniformitarianism and key bed | uniformitarianism- the processes occuring today have been occuring since the Earth formed- James Hutton key bed- whena a layer is formed by an instantaneous or short- lived event; a time marker. |
| how are radioactive isotopes found in rocks used to find their absolute age? | |
| what do dendrochronologists study? | the science of comparing annual growth rings in trees to date events in the past. |
| what is the half life of carbon 14 and what material does it date? | |
| what is the age of earth? how was the number arrived at? | 4 billion years. |
| what are the major sources of heat for the earths interior? | |
| distinguish between original preservation and altered hard parts. | origninal- both hard and soft parts very uncommon to remain or exist. altered- organic material is gone. hard parts have been changed. |
| what was the connection between zircons and finding the age of earth? | |
| how did cyanobacteria in stromatolites change the earth | |
| outgassing |
Created by:
dk7
Popular Earth Science sets