<p>In the interior of the Arctic islands during the melting</p>
<p>season, even small streams must be crossed</p>
<p>with great care because near-zero water</p>
<p>temperatures and the typically rocky and unstable</p>
<p>nature of stream beds.</p>
<p>I can see that "because" definitely has to be "due to", but what I was wondering is why is it "typically" and not "typical"?</p>
<p>typically makes sense to me</p>
<p>I chose typically first too.. and missed it. I thought Due to was non standard...</p>
<p>Why do they use the adverb and not the adjective to describe other adjectives?</p>
<p>Are adverbs used to describe adjectives?</p>
<p>Yes. Adverbs can describe adjectives as well as verbs. There are many ways to fix that sentence. For example, you could put "of the" after "because", or you could attach some kind of predicate to the end.</p>