Earthquakes
What causes earthquakes?
Tectonic plates colliding
What is a tsunami?
A tsunami is a big wave.
What came out of Mt. St. Helens when the volcano erupted?
Ash and toxic gases.
What do earthquakes create?
Rivers, mountains, oceans, and valleys
Underwater earthquakes cause tsunamis.
When did Mt. St. Helens erupt?
May 18th 1980
What is the average number of earthquakes each day?
50
How fast do tsunamis go?
Tsunamis travel hundred of miles an hour.
How did scientists know the volcano was going to erupt?
There were several earthquakes.
What is the name of the machine that measures the magnitude (strength) of an earthquake?
It is a seismograph
How tall can a tsunami get?
A tsunami can get 21 meters (70 feet) tall.
How many people died in the eruption of Mt. St. Helens?
57 people
What mountain range was created when the Indo-Australian and Eurasian plates collided?
The Himalayan mountain range.
How do we know when a tsunami is coming?
Satellites, and radio-operated buoys can detect tsunamis.
What is the name for when water quickly melts and causes a flood.
a Lahar