1 .		Simply stated, the principle of fossil succession states that the physical, chemical, and biological laws that operate today have also operated in the geologic past.   True  False
2 .		The Mesozoic era is the age of "recent life" on Earth.   True  False
3 .		To state specifically the point in history when something took place, for example, the extinction of the dinosaurs about 66 million years ago, is to use a type of date called a numerical date.   True  False
4 .		The "matching-up" of rocks from similar ages but different regions is referred to as correlation.   True  False
5 .		The time required for one-half of the nuclei in a radioactive sample to decay is called the chronology of the isotope.   True  False
6 .		The Hadean, the Archean, and the Proterozoic eons are commonly referred to as the Precambrian.   True  False
7 .		To assume that rock layers that are inclined have been moved into that position by crustal disturbances is to apply a principle of relative dating known as cross-cutting relationships.   True  False
8 .		To state that "in an undeformed sequence of sedimentary rocks the oldest rock is at the bottom" is to use a basic principle of relative dating called the law of superposition.   True  False
9 .		An unconformity is a break in the rock record during which deposition ceased, erosion removed previously formed rocks, and then deposition resumed.   True  False
10 .		An eon is a subdivision of a geologic era.   True  False
11 .		Pieces of one rock unit contained within another are called inclusions.   True  False
12 .		The unit of geologic time known as the Precambrian is noted for its "ancient life."   True  False
13 .		A fossil of an organism that was widespread geographically but limited to a short span of geologic time is often referred to as a daughter fossil.   True  False
14 .		The fact that fossils succeed one another in a definite and determinable order is known as the principle of fossil succession.   True  False
15 .		Using radioactive isotopes to calculate the ages of rocks and minerals is a procedure called radiometric dating.   True  False
16 .		The entire geologic time scale was created using numerical dates.   True  False
17 .		Rapid burial and the possession of soft tissue parts are necessary conditions for fossilization.   True  False
18 .		All rocks can be dated radiometrically.   True  False
19 .		Every element has a different number of electrons in the nucleus.   True  False
20 .		When magma works its way into a rock and crystallizes, we can assume that the intrusion is younger than the rock that has been intruded.   True  False
21 .		During radioactive decay, as the percentage of radioactive parent atoms declines, the proportion of stable daughter atoms also decreases.   True  False
22 .		Most layers of sediment are deposited in a horizontal position.   True  False
23 .		No place on Earth has a complete set of conformable strata.   True  False
24 .		An accurate radiometric date can only be obtained if the material remains in a closed system during the entire period since its formation.   True  False
25 .		Of the three rock types, igneous rocks are more suitable for radiometric dating than sedimentary rocks.   True  False