Layers of the Earth
Plate Boundaries
Plate tectonics
Volcanoes
Misc.
100
What is the name of the layer of the Earth that we live on?
The crust
100
Name the three types of plate boundaries we have studied
Divergent, Convergent, Transform
100
what is the theory of plate tectonics?
the earths lithosphere is split into plates and these plates slowly move.
100
what different types of eruptions can volcanoes have?
explosive and non-explosive (or gentle)
100
how old is the earth?
approximately 4.6 billion years old.
200
Name the four layers of the Earth in order.
Crust, mantle, outer core, inner core
200
What geologic activity do we expect to find at convergent boundaries?
Earthquakes, volcanoes, and mountain building
200
what are plate boundaries?
the edges of a plate and where two or more plates meet.
200
what type of volcano is generally safe to be around during an eruption? why?
shield volcano because they have less gassy, and less explosive eruptions.
200
how has the surface of the earth changed over time? give three changes.
continents have formed continents have moved volcanoes have formed crust has been created crust has been destroyed mountains have formed
300
what changes occur as we go deeper and deeper into the earth? give three examples.
the temperature increases the composition changes the state changes
300
At what type of boundary do only earthquakes occur?
A transform boundary
300
Explain what happens to two plates when an earthquake occurs.
Two plates are pushing against one another, building stress. Then, the plates suddenly slip causing an earthquake.
300
volcanoes most commonly form at what types of plate boundary?
at convergent or divergent boundaries
300
Name 2 pieces of evidence that support plate tectonics
The continents fit together like puzzle pieces. The same fossils were found on both South America and Africa, even though these organisms would not have been able to swim across the ocean.
400
What is the state of the Mantle?
partly solid and partly liquid
400
what happens at a divergent plate boundary?
plates pull apart causing magma to come to the surface creating new crust; earthquakes also occur.
400
how do scientists identify where plate boundaries are?
by recording where earthquake and volcanic activity is-these generally occur at plate boundaries.
400
In a subduction zone where a continental and an oceanic plate meet, which plate will dive underneath the other?
The oceanic plate dives beneath the continental plate.
400
why do we not experience volcanoes or earthquakes in Chicago?
Because we are far from any plate boundaries!
500
what is the name of the first 100 km of the earth (contains the crust and part of the mantle)?
The lithosphere
500
Identify and explain what happens at the two types of convergent boundaries
At a subduction boundary, one plate dives beneath another. (oceanic and continental crust) At a mountain-forming boundary, the two plates "smush" against each other, forming mountains. (continental and continental crust)
500
what plate is called the 'ring of fire'? why?
the pacific plate; because it has many active volcanoes and is shaped similarly to a ring.
500
what are three differences between shield, cinder cones, and composite volcanoes
type of eruption type of magma shape size
500
New seafloor is created everyday. Why isn't the Earth getting larger?
Because subduction zones occur! Places where one plate is recycled back into mantle.
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