Assertion: crust's amount | /r/HasProperty | about 25%
Facets:
value: by 3.0 ga
type: TEMPORAL
value: ago
type: TEMPORAL
Source sentences:
text: By 3.0 Ga ago the amount was about 25%, and following a period of rapid crustal evolution it was about 60% of the current amount by 2.6 Ga ago.