Assertion: moon's water | /r/HasProperty | deposited on earth
Facets:
value: during its early history
type: TEMPORAL
Source sentences:
text: A favorite theory is that water, either as water by itself or as its components of hydrogen and oxygen, was deposited on Earth during its early history--mostly during a period of "late heavy bombardment" 3.9 billion years ago--by the impacts of comets and asteroids.