Earthquakes
Volcanoes
Surface Wave
Plates Tectoniccs
Earth's Layers
100
Earthquakes are caused by the slow deformation of the outer, brittle portions of "tectonic plates", the earth's outermost layer of crust and upper mantle.
What causes earthquakes?
100
Kilauea volcano on Hawaii is the world's most active volcano, followed by Etna in Italy and Piton de la Fournaise on La Réunion island.
What are the most active volcanoes?
100
a disturbance that transfers energy from place to place
what is a wave?
100
Asthenosphere it flows very slowly
What is "plastic" rock, and how does it move?
100
The inner core is solid and the outer core is liquid.
What is the difference between the inner core and the outer core?
200
Yes!
Can people cause earthquakes?
200
The word "volcano" comes from the Roman God of Fire, Vulcanus. Also the small volcanic island of Vulcano in the Eolian Islands off Sicily, was called after that god.
What is a volcano?
200
a medium
what do waves travel through?
200
15
How many major tectonic plates have scientists identified?
200
Because of all the layers of the earth. The pressure on the core is 2 million times more than on earth's surface.
Why is there so much pressure on the earth's core?
300
No! A common misconception is that of a hole in the ground that opens during an earthquake to swallow up unfortunate victims.
Dose the earth open up during an earthquake?
300
When there are no signs of an active magma chamber beneath the volcano (no unusual seismic activity, no volcanic gasses escaping etc.), and when there hasn't been any activity for a long time span (at least 10,000 years).
How do you know when a volcano cannot erupt anymore?
300
when a source of energy causes a medium to vibrate
what cause waves to start?
300
By studying data from earthquakes
How do scientists identify plate boundaries?
300
The thin membrane.
Which part of an egg compares to the Moho?
400
No, except for very rare exceptions. Every year, hundreds of earthquakes occur in Canada. Only a very tiny minority of these precede a larger earthquake.
Does a small earthquake mean that a larger earthquake is coming?
400
Volcanoes are usually less dangerous than other natural hazards such as earthquakes, tsunamis and hurricanes.
How dangerous are volcanoes?
400
it moves the medium the way the wave travels
how does a longitudinal wave move?
400
Some form when plate motions generate magma that erupts on Earths surface
How do volcanoes help to identify the locations of plates boundaries?
400
The increased amount of iron.
What do scientists believe explains the increased density of material deeper into the mantle?
500
Earthquakes occur all over the world
Where do earthquakes occur?
500
I've always been fascinated by nature's forces. ... I was studying geology until one day I found myself on the top of Stromboli volcano and watched the nightly spectacle of its eruptions.
How did you become a volcanologist?
500
the maximum distance that the particles of the medium carrying the wave move away from their rest positions
what is the amplitude of a wave?
500
That the pacific oceans is surrounding by plate boundaries
What do the characteristics of the Pacific Ring of Fire indicate?
500
The temperature increases as you go deeper.
What happens to temperatures in the mantle?
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