Unit 5 Vocabulary Review
1. ______ Trace Fossil
Name: __________________________________
A. Age of something compared to other things
B. The process by which the remains of ancient living things
are turned to rock
2. ______ Fossilization
C. The geologic principle that states that in horizontal layers of
3. ______ Sedimentary Rock
undisturbed sedimentary rock, each layer is older than the
one above it and younger than the one below it.
4. ______ Mineralization
D. A fossilized sign that a plant or animal once lived in an area
5. ______ Fossils
6. ______ Paleontologist
E. Rock made of layers of tightly packed sand and clay
F. To fill with a mineral substance and convert to new mineral
form
7. ______ Amber
G. A scientist who studies fossils and ancient life
H. Hardened tree sap
8. ______ Absolute Age
9. ______ Relative Age
I.
Remains of ancient life that has been turned to stone
J. Specific age of a rock or fossil
K. The process in which the nuclei of radioactive elements
10. ______ Law of Superposition
11. ______ Invertebrate
break down
L. One of the units of geologic time into which geologist
divide eras
12. ______ Amphibian
13. ______ Vertebrate
M. A vertebrate whose temperature is determined by the
temperature of the environment around it, that has lungs and
scaly skin, and that lays eggs on land.
14. ______ Reptile
15. ______ Mammal
16. ______ Mass Extinction
N. An animal without a back bone
O. A gap in the geologic time record that shows where rock
layers have been lost due to erosion
P. One of the three long units of geologic time between the
Precambrian and the present.
17. ______ Era
18. ______ Period
Q. An animal with a back bone
R. A vertebrate whose body temperature is internally regulated,
has skin covered in fur or hair, and produces milk for its
19. ______ Unconformity
20. ______ Radioactive Decay
young.
S. When many species of living things die off at the same time
T. A vertebrate whose body temperature is determined by the
temperature of the environment, and that lives its early life
in the water and its adult life on land.