Relative dating ppt

Documents Flashcards Grammar checker. Science Earth Science Geology 8. What causes geologic change changes to the land on earth? What are the 3 types of plate boundaries?

Presentation on theme: "I. Principles of Relative Dating"— Presentation transcript:

Which plate boundary causes sea floor spreading? LEQ 3 Assessment 15 min.

Relative Dating of Rock Layers

Student Line 8 min. Relative T-Chart 12 min.

Sandwich Demo 10 min. Group Challenge 10 min. Law of Superposition Notes 15 min. Ticket Out 5 min. What is the difference between exact and estimate? Which of our vocabulary words do you think means estimate? Scientists use several strategies to determine age of rocks and fossils.

Presentation on theme: "Relative Dating."— Presentation transcript:

Does the amount of time you shake the box affect the outcome? Do the number of atoms you start with affect the outcome? How do scientists use radioactive decay to date fossils and artifacts? Relative dating provides the exact age of a rock while absolute dating provides a rough estimate of the rocks age.

Relative Dating.

Relative dating can estimate a rocks age only in relation to other objects and events while absolute dating can provide the actual age Relative dating uses several types of radioactive decay to determine an objects relative age while absolute dating only uses the half of uranium Relative dating and absolute dating can only determine the rocks age in relation to other objects or events So… Why Do We Care?

List these eras in order from oldest to youngest the present! Rock record provides evidence of geological events and life forms of the past. Processes observed on Earth in the present also acted in the past. Earth is very old and has changed over time. Although many features of the Earth may seem to be unchanging over our lifetime, they are still changing, but on time scales of hundreds, thousands or even millions of years.

Absolute vs. Relative Dating - ppt download

The universe is The Earth is 4. The moon is 4. Relative Dating Absolute Dating. Relative dating determines the sequence in which events occurred, but not how long ago they occurred. Usually applies to sedimentary rock, but can also be applied to lava flows and layers of ash from volcanic rock. Scientists use radioactive decay to determine the age of the rock.


  • Absolute vs. Relative Dating?
  • I. Principles of Relative Dating.
  • Presentation on theme: "Absolute vs. Relative Dating"— Presentation transcript:!
  • Absolute vs. Relative Dating?

Proton Electron Neutron Which subatomic particles make up the mass of the atom? Atoms of the same element can have different numbers of neutrons; the different possible versions of each element are called isotopes. For example, the most common isotope of hydrogen has no neutrons at all; there's also a hydrogen isotope called deuterium, with one neutron, and another, tritium, with two neutrons.


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When the organism dies, the "clock" starts as the carbon decays, changing the ratio. Technician in a radiocarbon dating laboratory. Radiocarbon dating relies on a simple natural phenomenon. Because it reacts identically to C and C, C becomes attached to complex organic molecules through photosynthesis in plants and becomes part of their molecular makeup.

Animals eating those plants in turn absorb Carbon as well as the stable isotopes. This process of ingesting C continues as long as the plant or animal remains alive. The C within an organism is continually decaying into stable carbon isotopes, but since the organism is absorbing more C during its life, the ratio of C remains about the same as the ratio in the atmosphere. When the organism dies, the ratio of C within its carcass begins to gradually decrease.