Earth's Waters Section 1–1 Review and Reinforce (p. 17) 1
Review and Reinforce. 1. minerals. 2. Mold. 3. Cast. 4. carbon. 5. activities. 6. Preserved a rock? By applying the law of superposition. How are fossils used to date rocks? The age of . answers against the figure The Geologic Time. Scale in. Relative dating worksheet answer key relative age dating. Section 1 Students will be able to estimate the age of a fossil using radioactive dating methods. Radioactive Dating: Half-Life & Geologic Time . Answers: Yes; 2 half-lives. .. This lesson may be used to reinforce or review earlier lessons about the rock.
Investigate the process of radioactive dating and describe how this method can be used to determine the age of the Earth and many other objects. Solve multi-step real-life mathematical problems using decimals and proper operations to estimate and then properly calculate the age of various materials.
- Radioactive dating review sheet
Prior Knowledge Students should: Be familiar with the rock cycle and the three types of rocks igneous, metamorphic, and sedimentary. Understand the relative ages of layers from the law of superposition and what fossils are, but need not yet know exactly how the absolute ages of rock layers or fossils are determined.
Have knowledge of the geologic time scale and the names of the eons throughout history. Instructional Suggestions This lesson is intended to be completed in 1. The lesson plan indicated below is presented in time-oriented breakdown: Begin class with a brief introduction to the concept of radioactivity. If you do not have access to these, a class discussion, read aloud from an appropriate selection of textor other video review would be appropriate.
The extrusion is younger, because extrusions are always younger than the rock layers below them.
Radioactive Dating: Half-Life & Geologic Time -
The fault is younger than layer A, because rock layers are always older than the faults they contain. The fossil might be able to be used as an index fossil. Geologists can use index fossils to match up rock layers at locations that are far apart. They cannot use radioactive dating because sedimentary rock layers are made of particles from other rocks. Dating would provide the ages of those particles, not the rock. They can use radioactive dating, because extrusions and intrusions are made of igneous rock.
Rock layer C is at least 80 million years old, because it is older than the intrusion that cuts partway across it. Geologists subdivide eras into periods and periods into epochs.
Radioactive Dating: Half-Life & Geologic Time
They studied rock layers and index fossils worldwide. The divisions of the geologic time scale depend on events in the history of life on Earth. Mesozoic or Cenozoic 9.