Worksheet will be is uploaded and answer the questions below. The questions will be answered in the worksheet while also the worksheet filled out.
- What unstable isotope would be best to refine the date of bones found in a cave hearth built by humans between 30,000 and 50,000 years ago?
- We find samples of an igneous rock demonstrate it has been through 4 half-lives. The test element has a half-life of 150 million years. How old is the rock?
- Argue for or against the following: A stone tool fashioned from a chunk of obsidian yields a date of 5,000,000 years old, therefore, the tool was made by a human 5,000,000 years ago.
- You are trying to figure out the age of what is thought to be a very old fossil with a volcanic ash layer immediately above the fossil. We know the fossil is at least more than 250 million years old. Should we use carbon 14 to date the fossil, or uranium 238 to date the volcanic ash layer, and why?
- If the parent isotope starts with 100 grams, but your samples yield only 12.5 grams of the parent isotope, how many half-lives have passed?
Mineral and Rock Identification:
For your mineral and rock identification, you may convey your answers by way of a table or a sentence.
Part 1 – Using the following web link to http://profharwood.x10host.com/GEOL101/Labs/Minerals/index.htm Harwood’s mineral identification testLinks to an external site., please identify numbers 1, 3, 4, 6, 9, 10, 11, 13, 16, 17, and 19. Give a brief description of each from the parameters that give you the box at the top of the screen saying you got it right (for the rocks, too).
Part 2 – Using the following web link to http://profharwood.x10host.com/GEOL101/Labs/Igneous/index.htm Harwood’s igneous rock identification testLinks to an external site., please identify numbers 1, 2, 3, 5, 7, 8, 9, 11. Give a brief description of each.
Part 3 – Using the following web link to http://profharwood.x10host.com/GEOL101/Labs/Sediment/index.htm Harwood’s sedimentary rock identification testLinks to an external site., please identify numbers 1, 2, 3, 4, 5, 8, 9, 11, 12. Give a brief description of each.
Part 4 – Using the following web link to http://profharwood.x10host.com/GEOL101/Labs/Metamorf/index.htm Harwood’s metamorphic rock identification testLinks to an external site., please identify all samples. Give a brief description of each.