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With respect to the dangers of mass wasting which of the following conditions would be the best in terms of locating a house or structure?
gentle slope, light and steady rain and heavy vegetation
In order for caves and cave deposits to form which of the following conditions must be met?
dissolution must take place below groundwater table followed by deposition when the cave is above the groundwater table
The geologic time scale is constructed from
the principles of radioactive decay and a sequence of geologic and biologic events
A drainage basin is
a region bounded by divides, containing all the tribuataries of a main stream and carrying all the runoff from the entire region
Construction of a dam in the path of a river will have what effect on base level?
temporarily raise it
Why is little groundwater found at depths greater than 750 meters?
there are few open pores below that depth
Which of the following situations will lead to a decrease in erosion by a stream?
an increase in channel width
Which of the following statements about the length of the Precambrian EON is correct?
It covers the first 4 billion years in Earth's history
Which of the following questions about the water table is wrong?
It is always at the same depth in a given place
Radiocarbon dating of dead organisms is possible because
life forms stop accumulating carbon 14 when they die
Which of the following statements concerning radiometric dating is wrong?
Radioactive isotopes decay faster on Earth's surface than they do at Earth's core
The boundary between the zone of aeration (or zone of undersaturation) and the zone of saturation is known as the?
Scientists have concluded that the Earth is 4.5 billion years old. Which dating method was used to obtain this age?
uranium-lead dating (half-life: 4.5 billion years)
Avalanches are known to obtain very high speeds due to the presence of trapped air. What role does this air play?
It decreases friction between grains
A sample currently contains 20 parent atoms and 60 daughter atoms. Given that the half-life is 2,000 years how old is the sample?
Which of the following drainage patterns results from a river on a flat region consisting of hard bedrock with rectangular joints and cracks?
In meandering streams, water velocity tends to be the greatest
along the outer bank of a meander loop
For a given river, which of the following floods would least likely to occur every year?
a 100-year flood
Which of the following terms described a curved, coarse-grained deposit that forms on the inside curve of a stream?
Which of the following would be the worst in terms of mass wasting - worst for locating a structure such as a house?
steep slope, thick debris cover, and sparse vegetation
An undeformed sedimentary layer is ___ than the layer above and ___ than the layer below.
The illustration above depicts a cross section through a pile of quartz sand. The angle depicted in the diagram is called the
Telephone poles that lean slightly downhill are a likely result of which of the following processes?
A rock currently contains 30 parent atoms and 90 daughter atoms. Given that the half life is 1,000 years (and the sample contained no daughters initially) estimate the age of the rock
Radiometric dating is possible if a rock contains a measurable amount of
both daughter and parent atoms
Einstein was one of many great minds to ponder why streams meander. He concluded a thought experiment whereby he used the concept of helical flow to explain the origin meanders. In class we refer this experiment as?
the teacup experiment
A radioactive has decayed to the point that 1/8 of the original content is left. How many half-lives have passed?
The half life of a radioactive isotope is
the time it takes for half of the radioactive atoms to decay
What kind of rock type was initially used to construct the geologic time scale?
fossil bearing sedimentary rock
Carbon-14 has a half life of approximately ______ years and is there for suitable to dating objects younger than approximately ______ years?
5 thousand and 50 thousand
Stripping soil of vegetation by burning or deforestation will ______ the likelihood of mass movements
Avalanches are known to obtain unexpectedly high speeds due to the presence of?
reduction of friction due to trapped air
If a dam is built, sediment will _______ on the upstream side of the dam and sediment will _______ on the downstream side of the dam.
A radioactive isotope decays down by 2 half lives. How many daughter atoms will have formed assuming that you had none to start with and started with 1000 parents?
Sample contains 70 parent atoms and 30 daughter atoms. Assuming that sample contained no daughter atoms initially how many parents did it contain originally?
For a given river, which of the following floods would be most likely to occur every year?
a 5-year flood
Sedimentary rocks cannot typically be dated by radiometric methods. This is so because?
newly formed or true sedimentary minerals are difficult to date
As a river flows towards the ocean it narrows but stays the same depth. Which of the following is true about the behavior of the stream as the channel narrows? Assume constant gradient.
Which of the following slopes is least stable?
a slope where the sedimentary layers dip parallel to the slope
Fission tracks is a dating method that is based on
tracks or scars left in minerals by the breakdown of radioactive elements
Which of the following best explains why there are no large deltas on the east coast of North America?
because the waves and tides in the atlantic ocean are too strong
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