plate tectonics

The epicenter of an earthquake is

• The point below the surface where rock begins to break and the first motion occurs
• The seismic station closest to the earthquake
• The place where the greatest damage occurs
• The point on the surface directly above the focus

An instrument that detects and measures earthquakes is a 

• seismogram
• focus seismic map
• focus
• seismograph 

Earthquakes under the water can cause _________________________________.

• tornadoes
• tsunamis
• lightening
• hailstorms

Which kind of waves usually do the most damage in an earthquake?

• P waves
• S waves
• L waves
• Radio waves

The focus of an earthquake is

• The point (below Earth's surface) where rock breaks
• The closest seismic station
• The place where the greatest damage occurs
• A fault

These are the first waves released during an earthquake

• S waves
• Surface Waves
• P waves

Sea-floor spreading begins at the 

• Deep ocean trench
• Mid-ocean ridge
  Mid-ocean ridge
• Continent's edge

The process that happens at the deep-ocean trench is called...

• sea-floor spreading
• adding material to the ocean floor
• subduction

Which layer is made up of iron and nickel?

• Crust
• Mantle
• Inner Core
• Lithosphere

What layer is the hottest?

• Core
• Crust
• Mantle