Science 2017 semester 2 Flashcards
What are the 4 layers of the Earth (in to out)
Inner core, outer core, mantle, crust
Crust size
-20-60km
Mantle size
2,900km
Inner core about it
Size
1300km
Outer core size
1110km
Three types of plate boundary’s
Convergent
Transform
Divergent
Theory’s of the supercontinent
Jigsaw
Fossil
Similar rock layers
About the supercontinent
Alfred Wegener first proposed the theory and he called it Pamela
Two tectonic plates
Continental
Oceanic
What is a convection current
It’s is a current in a fluid that results from convection
Convection current is located in the mantle
Continental-Continental convergent form?
Example
Forms mountain
Example Andes
Continental-oceanic convergent forms
When Continental crust pushes against oceanic crust is a subduction zone which creates volcanoes
Example- Andes
Oceanic oceanic convergent forms
Creates trenches
Example- Mariana Trench
Continental continental divergent forms and an example
Creates rifts or rift valleys
Example Iceland
Oceanic oceanic divergent forms
Mid ocean ridge is formed
Where the sea floor is separating and new oceanic crust is made
Wegener’s then theory states that all the continents were originally together, when the southern and northern hemisphere continents broke apart what was the name given to the large group of Southern Hemisphere continents?
Gondwana land
Wegener’s then theory states that all the continents were originally together, when the southern and northern hemisphere continents broke apart what was the name given to the smaller group of northern Hemisphere continents?
Laurasia land
Which type of plate boundary causes a sea floor spreading? Explain how this is the case?
Oceanic oceanic divergent cause sea floor spreading . When the sea floor does spread it creates new oceanic crust
What scale is used to measure the magnitude of an earthquake
Richer scale
What is the name given to someone who studies earthquakes
Seismologists
What are the two types of waves produced by earthquakes
Primary waves (p-waves) Secondary waves(s-waves)
List characteristics about the primary waves?
Fastest
Make objects and building vibrate vertically
Travel through solids and liquids
List characteristics about the secondary waves?
Slowest
Make objects move horizontally
Travel through only solids
3 main element that make up the earths crust
Silicon
Aluminium
Oxygen
What is the mantle made up of
It is made up of liquid rock
What is the inner core made up of
Iron and nickel
What is the outer core made up of
Iron and nickel
Is the inner core a solid or a liquid
Solid
Is the outer core a solid or a liquid
Liquid
Which layer does the convection current occurs in
Mantle
Which of one of the continental or oceanic plate is more dense
Oceanic
What is a subduction zone
A subduction zone is where one plate slides under (oceanic )the other (continental). This creates a volcano
What is the difference between magma and lava
Magma is in the volcano and lava is outside the volcano
