Chapter 15 Test - cloudfront.net Download

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Chapter 8 Study Guide – Answers
1. The relative age of rock is
A) its age compared to the ages of other rocks
C) the number of years since the rock formed
B) less than the age of the fossils the rock contains
D) its age based on how much carbon 14 the rock contains
2. About how old is the Earth?
A) 4.5 million years old
B) 4.5 billion years old C) 3 billion years old
D) 100 million years old
3. Radioactive dating enable geologists to determine
A) the age of the atoms in a rock
B) the half-life of a fossil organism
C) the relative ages of rocks
D) the absolute ages of rocks
4. What is a fossil?
A) any dead organism
C) a perfect copy of a rock
B) the preserved remains of organisms
D) an unusual type of rock
5. Dinosaurs lived during which Era?
A) Paleozoic B) Mesozoic
C)Cenozoic
D) Pre-cambrian
6. How do most fossils form?
A) Living things die and their remains are buried by sediments
B) The hard parts of an organism dry out in the air
C) The soft parts of an organism change to stone
D) Freezing preserves the remains of an organism
7. Rock that forms when molten material cools and hardens is called
A) molten rock B) sedimentary rock C) metamorphic rock D) igneous rock
8. Rock that forms when an existing rock is changed by heat, pressure, or chemical reaction is called
A) metamorphic rock
B) molten rock
C) igneous rock
D) sedimentary rock
9. According to the law of superposition, which layer of rock is the oldest?
A) Top Layer B) Bottom Layer C) Middle Layer
D) It’s always different
10. The fossils of organisms that were widely distributed but only lived during a short period of time are
called.
A) trace fossils B) petrified fossils
C) index fossils
D) carbon film fossils
11. The time it takes for half of the radioactive atoms in a sample of radioactive element to decay is the
element’s
A) Relative age B) absolute age C) Medium age D) Half life
12. The geologic time scale is a record of
A) the thickness of sedimentary rock layers
C) the life forms and geologic events in Earth’s history
B) the rate of fossil formation
D) the time since the evolution of dinosaurs
Turn Over
13. The Cenozoic era is often called the Age of
A) Fishes B) Reptiles C) Amphibians D) Mammals
14.Ancestors of human evolved into Modern humans (homo sapiens) about
A) 10 million years ago
B) 10,000 years ago C) 100,000 years ago
D) 50 million years ago
15. Which type of animal alive today is the closes living relatives of the dinosaurs?
A) reptiles B) amphibians C) birds
D) mammals
16. The first life forms appeared on earth about
A) 1 billion years ago B) 100 million years ago
C) 3 billion years ago
D) 10 billion years ago
17. What type of life forms were the only ones present during most of earth history?
A) single celled organisms B) fish C) plants D) dinosaurs
18. The first life forms on earth were
A) Single celled organisms
B) fishes
C) plants
D) insects
19. What is the most likely reasons that dinosaurs died out at the end of the Cretaceous period?
A) rise in sea level
B) they were hunted by man
C) asteroid hit the earth
D) they were killed by a virus
20. Present day is part of the __________ era.
A) Paleozoic B) Mesozoic
C) Cenozoic
D) Pre-cambrian
21. The super continent that existed about 225 million years ago is called
A) Eurasia
B) Devonian C) Pangaea
D) Permian
22. Type of organism that no longer exists on Earth is said to be
A) fossilized
B) sedimentary C) extinct D) petrified
23. During the Cambrian Explosion that began the Paleozoic Era, the many new forms of life that evolved
A) lived on land
B) were invertebrates that lived in the sea
C) were vertebrates covered with scales or fur
D) were single-celled
24. During the Devonian Period, animals that could live on land began to evolve. These animals still spent
part of their lives in the water. What were these animals called?
A) trilobites B) reptiles C) amphibians D) dinosaurs
25. If geologic time went by in a single day, all of human history would take place in about
A) 6 hours B) 1 hour
C) 1 minute D) 1 second
26. Which is the oldest time period?
A) Paleozoic B) Mesozoic
C) Cenozoic
D) Pre-cambrian