Fill in the blank 1
The seismic waves that do the most damage to structures and property during an earthquake are ________
Surface waves
________ are long cracks produced at divergent plate boundaries
Rifts
The ________ of an earthquake is the point on the surface of Earth directly above the focus.
Epicenter
The cooler, more dense material sinks down toward Earths core
The hotter, rising mantle is deflected sideways by the crust and cools
Material deep in the mantle is heated by Earths core
Hot, less dense material in the mantle is forced toward the surface
D C A B
What kind of fault is the San Andreas fault?
Strike-slip fault
An avalanche of glowing rocks flowing on a cushion of hot gases are called ________
Pyroclastic flows
_______ is magma that has flowed onto Earths surface
Lava
The instrument used to record earthquake activity is a ______
Seismograph
Tectonic plates
Ash and mudslides
Tephra
Both
Volcanoes
Volcanoes
The next Hawaiian island, Loihi, is 3,000 meters above the ocean floor, although it is still nearly 1,000 meters below the surface of the ocean. What tectonic plate features is forming th new island of Loihi?
It is formed by a hotspot melting through the earths crust
The _____ scale measures the magnitude of an earthquake
Richter
An undersea earthquake may produce a ________
Tsunami
The place inside Earth where the energy is an earthquake is centered is the ______
Focus
Hot springs
Rift
Magnitude
Volcanoes
Both
Earthquakes
Name two precautions you should take before and after and earthquake
Put heavy objects on lower shelves , stay away from windows.
Watch for down power lines, and damaged buildings.
The __________ is divided into about 13 major plates
Lithosphere
The ________ of an earthquake is based on the amplitude of the seismic waves.
Magnitude
A ______ is the surface of a break in a section of rocks
Fault
How are tectonic plates related to earthquakes and volcanoes?
Earthquakes and volcanoes occur most often where plates collide spread apart or move past each other
Describe tectonic plates using the terms crust, upper mantle, lithosphere, and motion
Tectonic plates are large sections of the lithosphere which consists of the upper most mantle and crust. They are always in motion
Building constructed to withstand most earthquakes are called ________
Seismic safe
Another name for earthquakes waves is _____
Seismic waves
____________ are cone-shaped mountains that eject lava and other materials
Volcanoes
How is stretching a rubber band until it breaks like Earths crust during an earthquake?
Earths crust is stressed and tension builds when the elastic limit is reached the rock breaks releasing the tension causing vibration
Tsunami
Seismic safe construction techniques
Earthquakes
Earthquakes