When referring to the planet, then it's "Earth". If referring to ground or dirt, it's "earth".
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No, "earth" does not always have to be capitalized. It is only capitalized when it is used as the proper name for the planet (Earth) or when it is the first word in a sentence.
When you are referring to the Earth's Moon then it is always capitalized, if you are talking about the moon of another planet then it is not always capitalized.
Yes, "Earth" should be capitalized in this context when referring to the planet as a proper noun.
Earth should always be capitalized because it is a Proper Noun.
Earth, as in we live on the planet Earth, is supposed to be capitalized. Earth, as in the dirt we walk on, is not supposed to be capitalized.
Yes, when referring to the title of the President of the United States, it should always be capitalized.
Yes, the word "Tuesday" is always capitalized because it is a specific day of the week.
Yes, the term "Hispanic" should be capitalized when referring to people of Spanish-speaking descent or origin. It is considered a proper noun in this context.
Yes, "I am" is typically capitalized because "I" is a pronoun and should always be capitalized in English.
No, circa does not need to be capitalized.
Yes, it should always be capitalized.
"OK" is typically capitalized because it is an abbreviation of "oll korrect," a humorous misspelling of "all correct." Capitalizing "OK" helps to distinguish it from other words and make it stand out as a separate entity in written text.