Fill in the Blank: Moon vs. Earth Comparison

The sentence compares the size of the moon to the size of the Earth. The phrase "compared __________" requires a preposition to establish this comparison correctly.

Understanding the Correct Preposition

The idiom "compared to" is used to highlight similarities or differences between two things, often when one is seen as representative of a category or when drawing an analogy. In this case, we are comparing the moon's size relative to Earth's size.

• The phrase "compared to" is the standard and most appropriate choice here. The sentence becomes: "Yet it is very small compared to Earth."

Analyzing Incorrect Options

Let's look at why the other options are less suitable:

• "than" is used with comparative adjectives (e.g., "The moon is smaller than Earth"). It does not fit directly after "compared".
• "with" ("compared with") is often used when comparing two similar things to note subtle differences or similarities, or in a more formal analysis. While sometimes interchangeable with "compared to", "compared to" is generally preferred when highlighting a stark difference in scale, as is the case here, or when making a figurative comparison.
• "in" does not fit grammatically or semantically for making a comparison of size between two distinct objects.

Therefore, "to" is the most appropriate preposition to complete the comparison.