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Cave
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===Primary=== <!--{{main|Primary cave}}--> [[File:hawaiian lava tube.jpg|thumb|Exploring a [[lava tube]] in [[Hawaii]].]] Caves formed at the same time as the surrounding rock are called '''primary caves'''. [[Lava tube]]s are formed through [[volcanic]] activity and are the most common primary caves. As [[lava]] flows downhill, its surface cools and solidifies. Hot liquid lava continues to flow under that crust, and if most of it flows out, a hollow tube remains. Such caves can be found in the [[Canary Islands]], [[Jeju Province|Jeju-do]], the basaltic plains of [[Eastern Idaho]], and in other places. [[Kazumura Cave]] near [[Hilo]], [[Hawaii (island)|Hawaii]] is a remarkably long and deep lava tube; it is {{convert|65.6|km|mi|abbr=on|adj=mid|long}}. Lava caves include but are not limited to lava tubes. Other caves formed through volcanic activity include rifts, lava molds, open vertical conduits, inflationary, blisters, among others.<ref name="ENCYCLO">{{cite book|page=84|title=Encyclopedia of Caves|first=David C.|last=Culver|publisher=Elsevier Academic Press|year=2004|isbn=978-0121986513}}</ref>
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