It has a massive electrostatic charge
That pulled the oceans off Mars and created a planetoid Ceres
When it gets close to the Earth, it pulls the oceans up, into a massive flood.
This enriches the land with the magnesium trees need to survive.
The flood in the bible was 5000m high.
This drains the oceans on the other side, and the water pours off the continental shelves, and flows over the ocean basins