Layers of the Earth
Plate Tectonics
Earthquakes
Volcanoes
Tsunamis
100
outer layer of the earth; made mostly of granite & basalt
What is the crust?
100
molten rock
What is another name for magma?
100
at plate boundaries
Where are most of the earthquake zones in world are located?
100
a crack in the earth's crust which magma flows through
What is a volcanoe?
100
two plates grinding; pressure builds up; motion displaces huge volume of water
What is a tsunami?
200
layer below the crust; made of silica & metal rich minerals
What is the mantle?
200
one plate sinks under another
What is a subduction zone?
200
Volcanic activity & methane gas
What are 2 main cause of earthquakes? (according to article)
200
hot spots
What are the points where volcanoes are formed?
200
earthquakes, volcanic eruptions, underwater explosions, landslides, & meteorite impacts
What are the causes of tsunamis?
300
appears to be a liquid & made mostly of iron
What is the outer core?
300
plates collide & buckle causing these to form
What are mountains?
300
the ignition of large pockets of this gas can cause earthquakes
What is methane gas?
300
millions of tons of ask that can bury a city
What is ash fall?
300
depth of water and speed of waves
What are causes of height of tsunami waves?
400
made mostly of solid iron
What is the inner core?
400
earth's crust is made of 6/7 large slabs & 20 smaller slabs
What is the theory of plate tectonics?
400
Russia, Alaska, South America, Mexico, California, Iran
Name 3 areas/countries where supplies of methane gas are found?
400
shield and composite
What are the two types of volcanoes?
400
Pacific Ocean
Where do 80% of tsunamis occur?
500
upper layer of mantle & lower layer of crust
What is the asthenosphere?
500
when plates slide past one another
What is an earthquake?
500
mountain top WILL NOT give to the extreme pressure; pushes lower & upper crust apart laterally (side-to-side)
Why do earthquakes occur during volcanic activity?
500
rocks & lava size of houses & cars hurled into the sky
What are volcsnic bombs?
500
2004 Indian Ocean Tsunami
What is the deadliest tsunami to be recorded?
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