div class=ts-pagebutton class=gotoPage data-page=1Page 1button div class=ts-imageimg data-url=gravity-earths-gravity-field-changes-from-place-to-place-htmlpage=1 data-page=1 class=ts-thumb lazyload alt=Page 1: GRAVITY Earths gravity field changes from place to place loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader031vdocumentssitereader031viewer20220224086216dcac55ab2b00f3537aa5html5thumbnails1jpg width=140 height=200 divdiv