Someday, when the Earth's restlessness has lifted up the low places, erosion will scour away the zillions of deposited grains, revealing, say, the corner of a foundation, or perhaps a dinosaur finger. Then the digging begins. In one place, wind buries things. In another, it uncovers them. Of course, some burying is achieved by catastrophic events.
Volcanoes can blanket square miles at a whack.
And a light, steady rain of meteors does actually add to the Earth's overall size. But the bulk of the burying is accomplished by slower means, as grains of sand slide downhill. The Earth isn't getting fatter. It's just suffering middle-age slump. Vocabulary leaning toward Sawyers, idiom.