Assertion: quagga | /r/AtLocation | thegreat lakes
Facets:
value: through ship ballast water
type: MANNER
Source sentences:
text: Zebra and quagga mussels were introduced to theGreat Lakes from the Caspian and Black Sea regionin the 1990s through ship ballast water.
text: Zebra and quagga mussels were introduced to the Great Lakes as larvae transported in ballast water on a commercial cargo ship.