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Reference.org
Graben
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<p>In <a href="/facts/Geology/WGvVRIYF">geology</a>, a graben is a <a href="/facts/Depression_(geology)/HhqyUdz5">depressed</a> block of the <a href="/facts/Crust_(geology)/FYG1kP4F">crust</a> of a planet or moon, bordered by parallel <a href="/facts/Normal_fault/0Fw2ladx">normal faults</a>. </p>