GJHS Plates, Earthquakes, and Volcanoes

What are earthquakes?

• rolling, shaking, moving or shocking of the Earth's surface
• a giant tidal wave
• an eruption
• a super storm

What is a tsunami?

• a large a long, high sea wave
• a moving of the earth
• magma flowing from inside the earth
• a column of rotating air

A tsunami is caused by______

• lots of rain
• a meteorite 
• a tornado
• an earthquake

What does the Richter Scale measure?

• the strength of an earthquake
• the water in the ocean
• how tall a volcano can be
• the length of a tsunami

What is the point underground where the earthquake begins.

• Epicenter
• Breaking Point
• Focus
• Ground Zero

What do earthquakes, volcanoes, and mountain building have in common?

• They occur suddenly.
• They are measured by seismographs.
• They result from plate motion.
• They cause major disasters.

In California, earthquakes strike because of plate motion along the:

• coastline of the Pacific Ocean.
• San Andreas Fault.
• Sierra Nevada Mountains.
• Edge of San Francisco Bay.

Earthquakes generally occur at plate boundaries, where

• stress on rocks is greatest
• the most rock is found
• stress on rocks is low
• magnetic pull is greatest

What is the epicenter of an earthquake

• the location along a fault where the first motion of an earthquake occurs
• a seismic wave tht travels along the surface of Earth
• the point on Earth's surface directly above the earthquake's focus
• the last place that motion in an earthquake is detected

This area is responsible for 90% of all earthquakes in  the world and contains numerous faults:

• Indian Ocean
• English Canal
• The Ring of Fire
• Mid-Atlantic Ridge