1. What is the correct order, starting from the surface, of Earth’s layers? A. Crust, outer core, inner core, mantle B. Mantle, outer core, inner core, crust C. Crust, mantle, outer core, inner core D. Outer core, inner core, crust, mantle

2. Geologists know that wherever plate movement stores energy in the rock along faults A. Earthquakes are not likely B. Earthquakes are likely C. An earthquake is occurring D. An earthquake could never occur

3. Earthquakes would most likely occur? a. Along the boundary marked A, where plates are moving apart. b. Along the boundary marked A, where plates are moving together. c. Along the boundary marked B, where A is being subducted. d. Along the boundary marked B, where B is being subducted. B A

4. Directions: use the following information given below to answer the question, Which type of volcano is Mt. St. Helens? A. Composite volcano B. Fire volcano C. Cinder cone volcano D. Shield volcano Mt. St. Helens in Washington is a tall, steep volcano that formed from many layers of lava alternating with layers of ash. It stood quietly for almost 123 years before it began to rumble in 1980. A series of small earthquakes shook the volcano during March of 1980. A part of its northeastern slope also began to bulge. The volcano finally erupted on May 18th. It blew away 400 meters of its top. Ash, gas, and steam roared out of the volcano. The fiery, hot wind blew down trees like toothpicks. It burned leaves and other vegetation 20 km away. The volcano also blasted an ash cloud 25 km into the atmosphere. The cloud drifted hundreds of kilometers to the east, blocking the sun at noon and dumping a thick carpet of ash on several northwestern states.

5. According to the theory of plate tectonics, explain what causes changes in the Earth’s surface.