 |
| 1 . |
|
The act of placing rocks in their proper sequence of formation is called __________.
|
|
| 2 . |
|
What fundamental principle of geology did Nicolaus Steno propose in 1669?
|
|
| 3 . |
|
An igneous rock that cuts through a sedimentary rock must be younger than that sedimentary rock. This is an example of __________.
|
|
| 4 . |
|
A break in the rock record where the deposition of sediment has been interrupted is referred to as a(n) __________.
|
|
| 5 . |
|
Which fundamental geologic principle allows geologists to use the remains of organisms when correlating rock units?
|
|
| 6 . |
|
Atoms of the same element that contain different numbers of neutrons are called __________.
|
|
| 7 . |
|
__________ is the result of the spontaneous decay of an atom's nucleus.
|
|
| 8 . |
|
The complete decay of uranium eventually produces a stable daughter consisting of the element __________.
|
|
| 9 . |
|
If the ratio of parent isotope to daughter isotope is 1:7, __________ half-lives have elapsed.
|
|
| 10 . |
|
Which isotopic system is commonly used by anthropologists and archaeologists, as well as geologists, for dating objects a few thousand years old?
|
|
| 11 . |
|
The first 88 percent of Earth's history, about which geologists know very little, is referred to as the __________.
|
|
| 12 . |
|
The first appearance of abundant fossil evidence in the geologic record occurs at he beginning of the __________ period.
|
|
| 13 . |
|
Which of the following sequences places the different units of the geologic time scale in proper order beginning with the greatest expanses of time?
|
|
| 14 . |
|
According to the information at this University of California site, the study of the "family tree of life" is referred to as __________.
|
|
| 15 . |
|
Referring to this University of California Museum of Paleontology site, determine when the first vertebrates developed on Earth.
|
|
| 16 . |
|
As stated in the information at this NASA site, the Universe began with a "Big Bang" about __________ years ago.
|
|
| 17 . |
|
According to the information at this NASA site, where did the heavy elements found in planets originate?
|
|
|
Answer choices in this exercise are randomized and will appear in a different order each time the page is loaded.
|
