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GEOLOGY 109 EXAM 1 QUESTIONS AND ANSWERS 2024
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GEOLOGY 109 EXAM 1 QUESTIONS AND ANSWERS 2024
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GEOLOGY 109 EXAM 1Sort the lunar time periods chronologically by placing the youngest period on top
and the oldest on bottom. - ANSWERS-Youngest:
Copernican
Eratosthenian
Imbrian
Nectarian
Why do impact craters make good geologic time indicators? (Select all that apply.)
- ANSWERS-They are laterally extensive (they cover large areas).
They are produced instantaneously.
Their features change with time as a result of degradation.
Which of the images of the Moon shows the oldest surface? They are all about
the same scale and about 200 km across. - ANSWERS-B
This graph shows impact crater sizes versus the number of craters per square
kilometer for several different regions of the Moon. Click on the line that
corresponds to the youngest terrain. - ANSWERS-light blue line (teal blue)
Which of these four lunar impact craters is the oldest? - ANSWERS-A
,Do the principles of superposition and cross cutting relations tell us how old a
particular crater or surface is in number of years (the absolute age)? - ANSWERS-
No.
What is the basis for our understanding of the absolute time scale of the Moon? -
ANSWERS-Rock samples brought back from the Moon have been dated using
radiometric techniques to give their absolute ages.
What do the absolute ages of lunar rocks tell us about changes in the rate of
impact cratering during the Moon's history? - ANSWERS-The rate of impact on the
Moon has declined dramatically with time so that modern impact rates are much
lower than they once were.
How old are the oldest rocks found so far on the Moon? - ANSWERS-The oldest
rocks found on the Moon so far are about 4.5 billion years old.
Examine this photograph of the nearside of the Moon. What shows that the
crater Copernicus is younger than Eratosthenes? (Select all that apply.) -
ANSWERS-It has fresh rays of impact ejecta radiating from it.
The rays from Copernicus cross over Eratosthenes crater.
Examine this photograph of the nearside of the Moon. How can you tell that
Eratosthenes crater is younger than Imbrium Basin? (Select all that apply.) -
ANSWERS-Imbrium is buried by smooth lava plains, but Eratosthenes is not.
Eratosthenes formed on the rim of Imbrium.
, Landforms produced by lunar volcanism include which of the following? (Select all
that apply.) - ANSWERS-lava flows
low shield volcanoes
lava channels
What process formed these sinuous valleys? - ANSWERS-The eruption of lava
flows.
Mare basalts are characteristically _________________________. - ANSWERS-
very fluid
Which is true about the most common volcanic rocks found on the Moon? -
ANSWERS-Lunar volcanic rocks are similar to the most common volcanic rocks on
asteroids and other terrestrial planets.
Click on one of the volcanic craters in this image. - ANSWERS-B
Click on the youngest lava flow that crosses this part of the lunar maria. -
ANSWERS-E
About how old are the lunar maria? - ANSWERS-They range in age from about 4.0
billion years old to at least 2.5 billion years old.
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