What year did the Persian soldiers besiege the Greek city of Potidaea?

• 479 BC

• 500 BC

• 450 BC

• 400 BC

What did the Potidaeans believe saved them from the attackers?

• A storm

• The wrath of Poseidon

• A strong wall

• Their soldiers

What is a tsunami commonly known as?

• Water wave

• Tidal wave

• Ocean wave

• Sea wave

What causes normal ocean waves?

• Earthquakes

• Wind

• Underwater eruptions

• Tectonic plates

How fast can a tsunami move?

• 100 miles per hour

• 200 miles per hour

• 300 miles per hour

• Over 500 miles per hour

What happens to a tsunami when it reaches shallow water?

• It disappears

• It speeds up

• It slows down and rises

• It stays the same

What does the word tsunami mean in Japanese?

• Harbor Wave

• Sea wave

• Strong wave

• Big wave

What was one of the deadliest natural disasters in history?

• 1989 Loma Prieta earthquake

• 2011 Japan earthquake

• 1994 Northridge earthquake

• 2004 Indian Ocean tsunami

What did people in some areas attempt to stop tsunamis with?

• Tall buildings

• Sea walls and flood gates

• Boats

• Helicopters

What is the safest course when facing a tsunami?

• Try to stop it

• Build a wall

• Get out of its way

• Swim against it