Earthquakes
This is the study of earthquakes
Seismology
What layer do we walk on?
Crust
Where do most volcanoes form?
This is the idea that the continents are always moving
Continental Drift
What is the name of the scale that tells us the magnitude of an earthquake?
Richter Scale
Which layer is made of iron and nickel, and is liquid
Outer Core
What type of igneous rock is made inside the volcano?
Intrusive
This type of volcano will never erupt again
Extinct
What causes the plates to move?
Convection currents
The highest number on the Richter scale is a _.
10
The mantle can be broken up into what three layers?
Upper mantle, asthenosphere, and lower mantle
Extrusive igneous rocks have ________ crystals.
What was one sign that Mt. St. Helens was going to erupt?
-Earthquakes
-Bulge
-Smoking
What is the name of the super continent that formed 300 MYA?
Pangea
Where do the most earthquakes occur?
Plate boundaries
What layer do convection currents happen in?
Asthenosphere
This type of igneous rocks cools slowly.
Intrusive
Mt. St. Helens is this type of volcano
Active
This is the shallow area around a continent
Continental shelf
An earthquake in the ocean can cause what?
A tsunami
This is the name of the layer where earthquakes happen?
Lithosphere
Pumice is an _________ igneous rock.
Extrusive
Why did the indigenous people call Mt. St. Helens Louwala-Clough?
Because it means 'smoking mountain'
What is the name of the fault between the North American and Juan de Fuca plates?