IX. Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the
correct answer to each of the questions
The Moon has been worshipped by primitive peoples and has inspired humans to create everything
from lunar calendars to love sonnets, but what do we really know about it? The most accepted theory
about the origin of the Moon is that it was formed of the debris from a massive collision with the
young Earth about 4.6 billion years ago. A huge body, perhaps the size of Mars, struck the Earth,
throwing out an immense amount of debris that coalesced and cooled in orbit around the Earth.
The development of Earth is inextricably linked to the moon; the Moon’s gravitational influence
upon the Earth is the primary cause of ocean tides. In fact, the Moon has more than twice the effect
upon the tides than the Sun does. The Moon makes one rotation and completes a revolution around the
Earth every 27 days, 7 hours, and 43 minutes. This synchronous rotation is caused by an uneven
distribution of mass in the Moon (essentially, it is heavier on one side than the other) and has allowed
the Earth’s gravity to keep one side of the Moon permanently facing Earth. It is an average distance
from Earth of 384,403 km.
The Moon has no atmosphere; without an atmosphere, the Moon has nothing to protect it from
meteorite impacts, and thus the surface of the Moon is covered with impact craters, both large and
small. The Moon also has no active tectonic or volcanic activity, so the erosive effects of atmospheric
weathering, tectonic shifts, and volcanic upheavals that tend to erase and reform the Earth’s surface
features are not at work on the Moon. In fact, even tiny surface features such as the footprint left by an
astronaut in the lunar soil are likely to last for millions of years, unless obliterated by a chance
meteorite strike. The surface gravity of the Moon is about one-sixth that of the Earth’s. Therefore, a
man weighing 82 kilograms on Earth would only weigh 14 kilograms on the Moon.
The geographical features of the Earth most like that of the Moon are, in fact, places such as the
Hawaiian volcanic craters and the huge meteor crater in Arizona. The climate of the Moon is very
unlike either Hawaii or Arizona, however; in fact the temperature on the Moon ranges between 123
degrees C. to –233 degrees C.
What is the passage primarily about?
the Moon’s effect upon the Earth.
the origin of the Moon.
a comparison of the Moon and the Earth.
what we know about the Moon and its differences to Earth.
Answer the question before viewing the answer below
Correct answer: D