_:vb6787875 "The mantle is important to our discussion in that its viscous nature can conduct convection currents that have effects on the crust upon which we live."@en . . _:vb6787874 . _:vb6787875 "2012, Chinle Miller, In Mesozoic Lands: The Mesozoic Geology of Arches and Canyonlands National Parks, Kindle edition:"@en . _:vb6787875 . _:vb6787874 "The generally unidirectional movement of a gas or fluid."@en . "1" .