Sentence:  A measure of the total mass accretion of meteoritic material by the Earth is obtained from analyses of <WSD>deep</WSD> sea sediments and dust collected in remote regions ( Pettersson , 1960 ) . 
Meaning of the word marked with <WSD> tags:  having great spatial extension or penetration downward or inward from an outer surface or backward or laterally or outward from a center; sometimes used in combination