GLY 1102 Topic 1 – Geologic Time and Geologic Principles

question

The basic rock unit defined on the basis of distinctive and easily recognized characteristics is a _______.
answer

formation
question

The principle which states that \”disturbed rocks or strata are older than those that cut or disturb them\” is the principle of ________.
answer

cross-cutting relationships
question

The ______ is the product of placing rocks in their proper sequence of formation to create a composite record of geologic events.
answer

relative geologic time scale
question

A horizon between rocks or sediments with distinctly different ages is called a ________.
answer

hiatus
question

Which of the following is not a type of unconformity?
answer

superconformity
question

Radiometric age dating techniques were used to establish the relative geologic time scale.
answer

false
question

An isotope is a species of the same element with the same mass and different atomic number.
answer

false
question

The principle which states that \”in layered rocks (or strata) the oldest rocks are at the bottom and the younger layers are on top\” is the principle of _______.
answer

superposition
question

______ refers to the number of protons of an atom.
answer

atomic number
question

In a succession of strata, fossil species succeed one another in a definite and recognizable order.
answer

true
question

The short half-life of carbon-14 limits the use of this technique to generally dating materials less than _______ years old.
answer

50,000 – 60,000
question

Disturbed rocks or strata are ______ those rocks that disturb or cut through them.
answer

older than
question

Particles that settle under the influence of gravity settle to more nearly vertical layers.
answer

false
question

In a succession of strata, fossil species succeed one another in a definite and recognizable order. This order of appearances and disappearances is largely the consequence of _______.
answer

all of these (organic evolution, the extinction of other species, and the appearance of new species)
question

The principle which states that \”strata extend in all directions until they thin against edges of the basins they accumulated in\” is the principle of _______.
answer

original lateral continuity
question

The original continuity of strata in a basin can be broken. A river can carve a canyon into a basin leaving once continuous layers stranded on opposite sides of the canyon. According to the principle of lateral continuity, these opposite sides of the valley were once laterally continuous.
answer

true
question

This type of unconformity separates horizontal sedimentary rocks above and below the unconformity.
answer

disconformity
question

Radiometric age dating, the basis of the establishment of the absolute geologic time scale, was not possible until after the discovery of radioactivity in the 20th century.
answer

false
question

Based upon physical characteristics alone (not fossil characteristics), which type of hiatus would be most difficult to identify?
answer

disconformity
question

Radioactive decay is the spontaneous nuclear disintegration of isotopes at ________ rates.
answer

constant
question

_______ is the sum of protons and neutrons in the nucleus of an atom.
answer

atomic mass
question

Which of the following is the oldest?
answer

lower creatceous
question

History is a sequence of events placed in proper chronological order.
answer

true
question

Which of the following is not a geologic period in the Mesozoic Era?
answer

cambrian

Get instant access to
all materials

Become a Member