Sample Earth Theme Unit Worksheet
Earth Theme Unit

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 Name _____________________________ Date ___________________
Earthquakes
Complete the puzzle.
 15 17 9 1 14 10 8 2 11 7 12 5 3 6 13 4 16 18
 secondary fault primary transform convergent faults surface aftershocks ten divergent energy epicenter seismograph vibrations seismic focus Richter earthquake

Down
 1 The ____ or S waves of an earthquake are side-to-side vibrations.
 2 An earthquake rated as 4 on the Richter scale is ___ times as powerful as one rated a 3.
 3 An earthquake releases energy in the form of ____ waves.
 4 The point underground at which an earthquake starts.
Across
 5 Most earthquakes occur along ____ lines, or lines where tectonic plates meet.
 6 The ____ or P waves of an earthquake are back-and-forth vibrations. A person who experiences an earthquake will feel this wave first.
 7 At a ____ fault boundary, two plates move past and away from each other.
 8 At a ____ boundary, plates move towards each other.
 9 The cracks or breaks in the earth's crust. This is where the plates that make up the earth's crust rub against each other.
 10 The ____ or L waves of an earthquake travel on Earth's surface.
 11 These often follow an earthquake.
 12 At a ____ boundary, plates move away from each other.
 13 This moves, in the form of vibrations, in all directions from the focus of an earthquake.
 14 The point on the surface of the earth directly above the focus of an earthquake.
 15 An instrument that detects and records earthquake vibrations.
 16 The form of energy released by earthquakes.
 17 A scale that usually ranges from 1 to 9. This scale is used to indicate the amount of energy an earthquake releases.
 18 A sudden shift or movement of the earth's crust.