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ASTR FINAL EXAM NEWEST ACTUAL EXAM 2025 COMPLETE ALL 250 QUESTIONS AND CORRECT DETAILED ANSWERS (VERIFIED ANSWERS) | ALREADY GRADED A+$22.99
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ASTR FINAL EXAM NEWEST ACTUAL
EXAM 2025 COMPLETE ALL 250
QUESTIONS AND CORRECT DETAILED
ANSWERS (VERIFIED ANSWERS) |
ALREADY GRADED A+
The nebular theory of the formation of the solar system
successfully predicts all but one of the following. Which
one does the theory not predict?
A) Planets orbit around the Sun in nearly circular orbits in
a flattened disk.
B) the compositional differences between the terrestrial
and jovian planets
C) the equal number of terrestrial and jovian planets
D) asteroids, Kuiper-belt comets, and the Oort cloud
E) the craters on the Moon Correct Answer C) the equal
number of terrestrial and jovian planets
The age of our solar system is approximately
A) 10,000 years.
B) 3.8 million years.
C) 4.6 million years.
D) 4.6 billion years.
E) 14 billion years. Correct Answer D) 4.6 billion years.
The age of the solar system can be established by
radioactive dating of
A) the oldest Earth rocks.
,B) the oldest rocks on the Moon.
C) the oldest meteorites.
D) the atmosphere of Mars.
E) It hasn't been done yet, but the age of the solar system
could be obtained from a sample of Io's surface. Correct
Answer C) the oldest meteorites.
What do meteorites reveal about the solar system?
A) They reveal that meteorites are much older than the
comets and planets.
B) Nothing, because they come from other star systems.
C) They reveal that the solar system once contained 10
planets.
D) They reveal that the age of the solar system is
approximately 4.6 billion years.
E) They reveal that the early solar system consisted
mostly of hydrogen and helium gas. Correct Answer D)
They reveal that the age of the solar system is
approximately 4.6 billion years.
Suppose you find a rock that contains some potassium-40
(half-life of 1.3 billion years). You measure the amount and
determine that there are 5 grams of potassium-40 in the
rock. By measuring the amount of its decay product
(argon-40) present in the rock, you realize that there must
have been 40 grams of potassium-40 when the rock
solidified. How old is the rock?
A) 1.3 billion years
B) 2.6 billion years
C) 3.9 billion years
D) 5.2 billion years
,E) none of the above Correct Answer C) 3.9 billion years
Rank the five terrestrial worlds in order of size from
smallest to largest.
A) Mercury, Venus, Earth, Moon, Mars
B) Mercury, Moon, Venus, Earth, Mars
C) Moon, Mercury, Venus, Earth, Mars
D) Moon, Mercury, Mars, Venus, Earth
E) Mercury, Moon, Mars, Earth, Venus Correct Answer D)
Moon, Mercury, Mars, Venus, Earth
What is differentiation in planetary geology?
A) the process by which gravity separates materials
according to density
B) the process by which different types of minerals form a
conglomerate rock
C) any process by which a planet's surface evolves
differently from another planet's surface
D) any process by which one part of a planet's surface
evolves differently from another part of the same planet's
surface
E) any process by which a planet evolves differently from
its moons Correct Answer A) the process by which gravity
separates materials according to density
Which of the following is not one of the four major factors
that can cause a long-term change in a planet's climate?
A) the fact that the Sun has gradually grown brighter over
the past 4 billion years
B) a change in the planet's axis tilt
, C) a change in the planet's abundance of greenhouse
gases
D) a change in the amount of dust particles suspended in
the planet's atmosphere
E) a change in the strength of the planet's magnetic field
Correct Answer E) a change in the strength of the planet's
magnetic field
What is the main reason mountaintops are so cold?
A) The air is thinner at higher altitudes.
B) Mountaintops are above much of the greenhouse gas
in the atmosphere.
C) The winds are stronger at higher altitudes.
D) There is more water vapor at higher altitudes, causing
there to be more snow.
E) All of the above are true. Correct Answer B)
Mountaintops are above much of the greenhouse gas in
the atmosphere.
Why isn't Earth's atmosphere mostly hydrogen?
A) Earth formed too close to the Sun for any planetesimals
to have hydrogen.
B) All the hydrogen was blasted away during the early
bombardment stage of the solar system.
C) Light gases such as hydrogen move faster than heavier
gases and escape from Earth's gravitational field.
D) The hydrogen is frozen in the polar ice caps.
E) All the hydrogen reacted with oxygen and formed the
oceans. Correct Answer C) Light gases such as hydrogen
move faster than heavier gases and escape from Earth's
gravitational field.
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