8th The Sun-Earth-Moon System (C20) Practice Test
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About this Exam
Prepare with the 8th The Sun-Earth-Moon System (C20) Practice Test practice quiz. This question bank includes 10 questions covering moon, phase, portion, sun, and path. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.
Sample Questions
Question
1
Which lunar feature are circular depressions formed by impacts?
Explanation:
Circular depressions formed by impacts are craters. When a meteoroid or asteroid strikes the Moon, the enormous energy blasts material outward and upward, excavating a bowl-shaped pit and leaving a raised rim around the edge. The impact distributes energy in a roughly circular pattern from the point of contact, which is why the resulting feature is typically round. In larger craters you can even see a central peak formed as the ground rebounds after the initial excavation. This distinguishes craters from maria, which are smooth basaltic plains formed by ancient lava flows filling basins; from the Highlands, which are rugged, light-colored, heavily cratered highlands; and from rilles, which are long channels created by volcanic or tectonic processes rather than impacts.
Question
2
When the visible portion of the Moon is getting larger, the Moon is which phase?
Explanation:
Growing illumination is waxing. When more of the Moon’s sunlit side becomes visible night after night, you’re in the waxing phases, moving from New Moon toward Full Moon through waxing crescent, first quarter, and waxing gibbous. After the Full Moon the illuminated portion starts to shrink—that’s waning—and New Moon is when it’s not visible at all. Third Quarter is part of the waning period, while New Moon is invisible. So, if the visible portion is getting larger, the Moon is waxing.
Question
3
The sun's path in the sky is highest during the summer ______.
Explanation:
The height of the Sun in the sky is determined by Earth's tilt relative to the Sun as the year changes. At the summer solstice, the Northern Hemisphere is tilted most toward the Sun, so the Sun climbs highest in the sky at noon and the day is longest. This extreme tilt makes the Sun’s noon altitude reach its maximum for the year, which is why that point marks the highest path across the sky. Equinoxes, by contrast, occur when the tilt is such that day and night are equal; the Sun is not at its highest point then. The terms perigee and aphelion describe the closest and farthest points in Earth's orbit (or the Moon’s in its orbit) and affect distance a bit, not the Sun’s height above the horizon in the sky. So the best fit for the statement about the Sun’s highest path in the sky during summer is the solstice.
Question
4
Which phase is seen when the illuminated portion is one quarter of the Moon's disk?
Explanation:
As the Moon orbits Earth, the portion that is illuminated by the Sun visible from Earth changes, creating the Moon’s phases. The halfway point in the cycle—about a quarter of the way from New Moon toward Full Moon—produces a phase where roughly half of the Moon’s disk is lit. This is the First Quarter, which is why it’s the correct choice: it represents the mid-point of the cycle with the near side showing a half-moon. In the Northern Hemisphere, you’ll see the right half illuminated at this phase. The other options correspond to 0% illumination (New Moon), 100% illumination (Full Moon), and the opposite half-lit at the three-quarter point (Third Quarter).
Question
5
Which event is associated with the longest daylight hours?
Explanation:
The changing length of daylight comes from the tilt of Earth's axis. When the Sun reaches its highest point in the sky during summer, the Sun’s path is longest and daylight lasts the longest in that hemisphere. That event is the Summer Solstice, which marks the longest day of the year. In contrast, the Winter Solstice has the shortest day, and the Equinoxes have roughly equal day and night. The Full Moon is about the Moon’s phase and does not determine how long daylight lasts.
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8th The Sun-Earth-Moon System (C20) Practice Test
This practice set contains 10 questions from the matching question bank and focuses on moon, phase, portion, sun, and path. Work through each question carefully, review the provided solutions, and revisit topics that need more study before your next attempt.
This is an independent study resource intended for practice and review; it is not an official examination or an endorsement by any organization named in the title.
Frequently Asked Questions
This quiz contains a total of 10 practice questions carefully selected to test your knowledge on this subject.
Yes, you will have exactly 0 minutes to complete the exam. A countdown timer will be visible once you start.
Yes, you can retake this practice test as many times as you need. The questions and options may be randomized on subsequent attempts to ensure comprehensive learning.
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