Subject: Earth Space Science
State Standard ES. 1.28 Discuss geologic evidence, including fossils and radioactive dating, in relation to Earth’s past.
State Standard ES. 1.28 Discuss geologic evidence, including fossils and radioactive dating, in relation to Earth’s past.
10 Minutes: Go over homework from last week: end of section assessment from page 561, questions 1-6. Makes sure the students have complete comprehension.
Big Ideas for the Day: Absolute-Age Dating of Rocks
10 Minutes: Students will read together the definitions of the words in this section and practices putting them into their own words. These will go into their Cornell Notes for this week.
10 Minutes: Students will play half-life bingo for candy prizes. If given the % of parent element, % daughter element, years elapsed, or number of half-lives, they should be able to fill in a prepared chart for commonly used isotopes that will be on the board. The students will fill in the missing slots.
Independent Practice: Students will complete Questions 1-4 on Page 565.
Big Ideas for the Day: Absolute-Age Dating of Rocks
- Radioactive isotopes are in all materials and can be used to date the age of rocks, fossils, and organic remains.
- Radioactive substances have different numbers of protons and neutrons that changes as the element emits nuclear isotopes. The element changes as the number of protons and neutrons change. The original radioactive element is called the "parent" and the new element is called the "daughter."
- Radiometric dating is where scientists determine the percentage of parent nuclei to daughter nuclei to give the absolute age of the sample.
- A half-life is the time it takes for half of the radioactive same to change from a parent element to a daughter element.
- Carbon 14, Uranium 238, both used in radiometric dating.
- Other ways to determine age include counting tree rings, seasonal climatic changes, and distinctive sediment layers.
10 Minutes: Students will read together the definitions of the words in this section and practices putting them into their own words. These will go into their Cornell Notes for this week.
10 Minutes: Students will play half-life bingo for candy prizes. If given the % of parent element, % daughter element, years elapsed, or number of half-lives, they should be able to fill in a prepared chart for commonly used isotopes that will be on the board. The students will fill in the missing slots.
Independent Practice: Students will complete Questions 1-4 on Page 565.
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