id	keyword
esrj-21108	gravity
esrj-21108	nigeria
esrj-21108	trough
esrj-21108	benue
esrj-21108	basement
esrj-21108	faults
esrj-21108	surface
esrj-21108	data
esrj-21108	middle
esrj-21108	area
esrj-21108	map
esrj-21108	basins