Earthquakes:
a flashlight near your bed.
under a door frame because they are strong and won’t collapse easily.
out about the best escape route from your house.

Volcano eruption:
all the windows to keep out toxic gases.
a wet handkerchief or piece of cloth to cover your mouth and nose.

Tornado:
down to the basement if your house has one.
the windows on the far side of the house to allow the air to escape.