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Reference.org
Gravity-based structure
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<p>A gravity-based structure (GBS) is a support structure held in place by <a href="/facts/Gravity/bqAN7DdQ">gravity</a>, most notably offshore <a href="/facts/Oil_platform/n1eKvqpy">oil platforms</a>. These structures are often constructed in <a href="/facts/Fjords/XbH8IzVE">fjords</a> due to their protected area and sufficient depth. </p>