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Chapter Resources. Click on one of the following icons to go to that resource. glencoe.com. Image Bank. Foldables. Video Clips and Animations. Chapter Summary. Chapter Review Questions. Standardized Test Practice. glencoe.com. Image Bank.
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Chapter Resources Click on one of the following icons to go to that resource. glencoe.com Image Bank Foldables Video Clips and Animations Chapter Summary Chapter Review Questions Standardized Test Practice
Image Bank Click on individual thumbnail images to view larger versions.
Image Bank Transfer Images • To transfer images to your own power point follow the following steps: • Open the “Resource” file from the CD-ROM disc – view the file in the “normal view” or “slide sorter view” mode - go to slide #2 – from there you can click through the images and follow these instructions. Click once on the image. • Copy the image • Go to your own power point document • Paste the image.
Image Bank Dinosaur Fossil
Image Bank Dinosaur Fossil
Image Bank Dinosaur Tooth
Image Bank Coal
Image Bank Cast Formation
Image Bank Dinosaur Footprints
Image Bank Fossil Range Chart
Image Bank North America 310 Million Years Ago
Image Bank Undisturbed Layers of Rock
Image Bank Folded Layers of Rock
Image Bank Map
Image Bank Date Chart
Image Bank Decay Graph
Image Bank Earth
Image Bank Question Image
Image Bank Question Image
Image Bank Question Image
Foldables Age of Rocks Make the following Foldable to help you understand how scientists determine the age of a rock.
Foldables Fold a sheet of paper in half lengthwise.
Foldables Fold paper down 2.5 cm from the top. (Hint: From the tip of your index finger to your middle knuckle is about 2.5 cm.)
Foldables Open and Draw lines along the 2.5-cm fold. Label as shown.
Foldables Summarize in a Table As you read the chapter, in the left column, list four different ways in which one could determine the age of a rock. In the right column, note whether each method gives and absolute or a relative age.
Reviewing Main Ideas 1 Fossils • Fossils are more likely to form if hard parts of the dead organisms are buried quickly. • Some fossils form when original materials that made up the organisms are replaced with minerals. Other fossils form when remains are subjected to heat and pressure, leaving only a carbon film behind. Some fossils are the tracks or traces left by ancient organisms.
Reviewing Main Ideas 2 Relative Ages of Rocks • The principle of superposition states that, in undisturbed layers, older rocks lie underneath younger rocks. • Unconformities, or gaps in the rock record, are due to erosion or periods of time during which no deposition occurred. • Rock layers can be correlated using rock types and fossils.
Reviewing Main Ideas 3 Absolute Ages of Rock • Absolute dating provides an age in years for the rocks. • The half-life of a radioactive isotope is the time it takes for half of the atoms of the isotope to decay into another isotope.
Chapter Review Question 1 Which of these fossils consists of a silhouette of the original organism? A. carbon film B. cast C. index D. mold PS 2.1f
Chapter Review Answer The answer is A. Carbon film fossils form when conditions in the sediment force liquids and gases from the organism’s body, leaving just carbon residue.
Chapter Review Question 2 Which of these conditions makes fossil formation least likely? A. buried quickly B. attacked by scavengers C. made up of hard structures D. possessed a shell PS 2.1f
Chapter Review Answer The answer is B. Dead organisms are more likely to become fossils when they are protected from agents of destruction of all kinds, including scavengers.
Chapter Review Question 3 Which occurs first in the formation of a cast? A. compaction turns sediment into rock B. hard part of organism dissolves C. mold fills with sediment D. organism buried in sediment PS 2.1f
Chapter Review Answer The answer is D. Compaction occurs after the object in sediment is buried by more sediment.
Chapter Review Question 4 How can fossils be used to show that rock layers in different locations are the same age? Answer If the same types of fossils are found in the layers in different locations, it’s likely that the rock is the same age. LE 3.2c
Chapter Review Question 5 The breaking down of unstable isotopes into other isotopes and particles is called __________. A. half-life B. inorganic metamorphosis C. radioactive decay D. relative decomposition PS 2.1f
Chapter Review Answer The answer is C. In some cases, large amounts of energy are released during this process.
Standardized Test Practice Question 1 What is the percent of parent isotope left after 5 half-lives? PS 2.1f
Standardized Test Practice A. 0.5 B. 1.0 C. 6.25 D. 10 PS 2.1f
Standardized Test Practice Answer The answer is C. With each successive half-life, the amount of parent material decreases by half.
Standardized Test Practice Question 2 How many half-lives will it take to reduce the parent material by 75%? PS 2.1f
Standardized Test Practice A. 1 B. 2 C. 3 D. 4 PS 2.1f
Standardized Test Practice Answer The answer is C. After 3 half-lives, 25% of the parent material remains.
Standardized Test Practice Question 3 In what age rock layers would you expect to find only Illaenus fossils? PS 2.1f
Standardized Test Practice A. 286-325 million years B. 360-410 million years C. 410-440 million years D. 440-505 million years PS 2.1f
Standardized Test Practice Answer The answer is D. According to the table, it is found in rock from 410-505 million years old, but it is the only one of the fossils found in the layers that are 440-505 million years old.
