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Science Review
Earthquakes
Question | Answer |
---|---|
What is the place where the earthquake cracks? | focus |
What is the spot on the surface directly above the earthquake's focus? | epicenter (where the most damage happens) |
Which are the fastest-moving waves? | P (primary) waves |
Which type of waves can travel through solids, liquids, and gases? | P (primary) waves |
Which are the second fastest-moving waves? | S (secondary) waves |
Which type of waves can only travel through solids? | S (secondary) waves |
Which are the last waves to leave the focus? | surface waves |
What instrument measures and records earthquake waves? | seismograph |
Which scale is used to measure an earthquake's intensity based on eyewitness observations? | Mercalli scale |
Which is a mathematical scale that measures the actual amount of seismic activity of an earthquake? | Richter scale |
Which is the more accurate earthquake scale? | Richter scale |
Who developed the Richter scale in 1936? | Charles F. Richter |
What are the tremors called that follow major earthquakes and can cause damage? | aftershock |
What is a very large ocean wave caused by an underwater earthquake or volcanic eruption? | tsunami |
What are waves of energy that travel through the Earth called? | seismic waves |
What is the outermost, rigid layer of the Earth composed of the stiff upper layer of mantle and crust called? | lithosphere |
Where do most earthquakes happen? | at plate boundaries |
Where do the most severe earthquakes happen? | at convergent boundaries |
Which type of fault is where two fault blocks move past each other horizontally? | strike slip fault |
Which type of fault is where two fault blocks move past each other vertically? | dip slip fault |
Which type of fault is where the hanging wall moves down? | normal fault |
Which type of fault is where the hanging wall moves up? | reverse fault |
Which type of reverse fault is has a gently dipping fault surface? | thrust fault |
What is a break in the earth's surface? | fracture |
What is the land mass above the fault-slides called? | hanging wall |
What is the land mass below the fault called? | footwall |
What type of mountains are formed when converging rock layers are squeezed together and pushed upward | folded mountains |
What type of mountains are formed at divergent boundaries? | fault block mountains |
What is the process of mountain formation called? | orogenesis |