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<p>variations are due to changes in <a href="page.php?w=Earth">Earth</a>'s <a href="page.php?w=gravitational_field">gravitational field</a> (<a href="page.php?w=geoid">geoid</a>) due to melting ice, rearrangement of continents, formation of sea mounts and other redistribution of rock.  The combination of satellite <a href="page.php?w=gravimetry">gravimetry</a> (e.g. <a href="page.php?w=GRACE_and_GRACE-FO">GRACE and GRACE-FO</a>) with altimetry can be used to determine <a href="page.php?w=sea_level_rise">sea level rise</a> and properties such as</p><p>
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