<p>(Sigh)</p>
<p>I believe this is an official question of the day from Nov. 1 2008, but I have no way of verifying.</p>
<ol>
<li>The Bear Gluch Limestone Formation in Montana is a sequence of bedded limestone layers up to **90 feet thick **and approximately 8 miles across. ** No error (E)**</li>
</ol>
<p>I thought the wrong answer is (D) across because:
1. You can't end a sentence with a preposition.
2. You could fix this by saying "8 miles wide"</p>
<p>The right answer is (E).</p>
<p>[The</a> Official SAT Question of the Day](<a href=“The SAT – SAT Suite | College Board”>The SAT – SAT Suite | College Board)</p>
<p>“8 miles across” is as good as “8 miles wide”.</p>
<p>across can be both - a preposition (as in “we walked across the street”) and an adverb - as in your sentence.
[across</a> - definition of across by the Free Online Dictionary, Thesaurus and Encyclopedia.](<a href=“Across]across - definition of across]across by The Free Dictionary”>Across - definition of across by The Free Dictionary)</p>
<p>Besides, ending a sentence with a preposition is not a sin:
[Grammar</a> Girl : Ending a Sentence With a Preposition :: Quick and Dirty Tips](<a href=“http://grammar.quickanddirtytips.com/ending-prepositions.aspx]Grammar”>http://grammar.quickanddirtytips.com/ending-prepositions.aspx)</p>
<p>First of all, WOAH HOW DID YOU FIND THAT LINK. I tried looking through the databases third party sides made, but the links wouldn’t work.</p>
<p>So on the SAT, isn’t ending a sentence with a preposition an error?</p>
<p>Actually, I don’t remember ever seeing on the SAT writing section a sentence ending with a preposition. My guess is that since there is still no 100% consensus on this construction among grammarians (the majority are in favor: [It’s</a> Usually Not Wrong to End a Sentence with a Preposition](<a href=“http://grammartips.homestead.com/prepositions1.html]It’s”>It's Usually Not Wrong to End a Sentence with a Preposition), [Ending</a> a sentence in a preposition](<a href=“http://www.grammar-monster.com/lessons/prepositions_ending_a_sentence.htm]Ending”>Ending a Sentence with a Preposition)), it’s unlikely to appear on the SAT.</p>