EAS-100-51: EARTH SCIENCE
HOMEWORK No. 8
- 4. Time required for half of a given amount of
parent radioisotope to decay into a daughter isotope.
- 7. The era of ancient life.
- 8. Common expression for past periods of prolonged
- 9. Concept that explained Earth's geology as the work
of short-term (often supernatural) events.
- 11. A creationist's estimate of the earth's age would
be a relatively - - - number of years.
- 13. Evidence of a period of erosion, as seen in
outcrops, of as a wavy line in a geologic events column.
- 16. Concept assuming that earth processes at work
today had always operated during the earth's past, as
- 19. Due to a hostile environment on land during the
geologic past, life probably originated at - -
- 20. The remains or traces of ancient life, generally
dated at 10,000 or more years old.
- 21. Geochronologists specialize in determining this
property in geologic materials.
- 22. A fossil particularly good for correlating
outcrops between different areas.
- 24. The Pennsylvanian Period was known as the Age of
- - - -.
- 27. To establish the equivalence of rocks of similar
ages between different localities.
- 29. The determination of the absolute age of a rock
or fossil is known as - - - - - -.
- 30. A word used to describe a past or present species
of life that no longer exists.
- 31. The Tertiary Period saw the development of a
large species of saber-toothed - - -.
- 32. Ectothermic animals have a body temperature that
reflects their environment; meaning they are - - -
- 33. Old dinosaur movies used to end with a big
earthquake and the explosion of a - - - - -
- 34. The geological period during which hard skeletal
parts first evolved, allowing preservation of fossils.
- 1. The Tertiary and Quaternary Periods are subdivided
into a shorter time unit called the - - - -
- 2. Due to metamorphism, fossils that would be found
in a shale would not be found in a - - - -
- 3. From ancient Greek, the word for "terrible"
as in "terrible lizards" (Mesozoic land reptiles).
- 4. Due to gravity, all sedimentary rocks were
originally oriented in the - - - - - - - - - -
- 5. A rare example of complete fossil preservation is
the woolly mammoth found trapped inside - -
- 6. If you found the - - - of a dinosaur,
it would be one of the most rare and valuable fossils.
- 10. Parallel layers of sedimentary rock.
- 12. Endothermic animals maintain a constant body
temperature, and are known as - - - -
- 14. The principle of ------------
relationships says "the cutter is older than
the cuttee." (2 words)
- 15. The study of ancient life.
- 17. A type of absolute age determination that
compares parent and daughter isotopes.
- 18. The law of ------------- says that
the rocks on the bottom are older than the rocks on the
- 23. The largest unit of time on the geologic time
- 25. Major extinctions of life have been caused by
climatic changes due to global - - - - -
- 26. The use of radiometric dating would produce a
relatively - - - - number for the age of the
- 28. A column of rocks in the field, exposed by
erosion, representing a sequence of geologic events.
- 29. Scientific information, usually gathered by
observation or experimentation.
Copyright © 1989 by William K. Tong