Related by context. Frequent words. (Click for all words.) 63 longitudes 59 landmasses 55 equatorial 54 landforms 54 transect 54 anisotropy 54 atmospheric circulation 53 mid latitudes 53 ecliptic 52 topographic 52 lithosphere 52 auroral 52 decadal 51 crustal 51 latitudes 51 transects 51 equator 51 horizontal 50 striations 50 periodicity 50 equinoxes 50 ITCZ 50 morphology 49 solar irradiance 49 amplitudes 49 taxa 49 longitudinal 49 maxima 49 spacings 49 synoptic 49 magnetization 49 invariant 49 ionospheric 49 topography 49 ellipse 48 ENSO 48 basaltic 48 topological 48 irradiance 48 curvatures 48 solstices 48 landform 48 dynamical 48 Fig. 48 continental crust 48 counter clockwise 47 conductance 47 radii 47 magnetic flux 47 geomagnetic 47 equatorial Pacific Ocean 47 convective 47 temperature gradient 47 oxygen isotopes 47 subduction 47 volcanism 47 areal extent 47 albedo 47 Eurasian continent 47 biogeography 47 Tibetan Plateau 46 morphologies 46 azimuth 46 polar caps 46 kinematic 46 easterly 46 Supplementary Fig 46 surface roughness 46 magmatic 46 longitude 46 facies 46 subtropical 46 southeasterly 46 basalts 46 equatorial regions 46 whorls 46 meter spacing 46 geomorphology 46 lithology 46 transverse 46 troposphere 46 supercontinent 46 oscillations 46 conformational 45 westerly 45 glacial melt 45 polar 45 northerly 45 lake sediments 45 temporal 45 phylogenetic 45 lithological 45 graben 45 curvature 45 dipole 45 counterclockwise 45 glaciation 45 vortices 45 scarps 45 Ordovician 45 seamount