What happened in 2005 when Hurricane Katrina struck Louisiana? Check all that apply.

Levees broke and failed to protect New Orleans.
A spillway would not open and cities were flooded.
It caused one of the costliest disasters in US history.
Eighty percent of New Orleans became covered in floodwater.
The city of New Orleans sank deeper due to subsidence.
An overflow of water damaged many businesses and homes.