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level: Earth's interior and layers

Questions and Answers List

level questions: Earth's interior and layers

Question	Answer
What is the crust made of?	silicon, aluminum, and oxygen
What is the least dense layer and how dense is it?	the crust, 2.7-3.1 g/cm3
What is the thickness and temperature of the crust?	5-70km, 0-550c
What is the oceanic crust mostly made out of?	basalt
What is the continental crust mostly made out of?	granite rock
Which is heavier, oceanic or continental crust?	oceanic
What is earths thickest layer?	the mantle
What is the mantle made of?	iron, magnesium, and silicon
What is the lithosphere?	the rigid layer made up of the uppermost part of the mantle and the crust
What is the lithosphere also known as?	rigid mantle
what is the asthenosphere?	the soft layer of the mantle of which the lithosphere floats.
What is the asthenosphere also known as?	plastic mantle
lower mantle definition	bottom portion of the mantle
other name of the lower mantle	stiffer mantle
core composition	iron and nickel
state of matter of the outer core	molten iron and nickel
state of matter of inner core	solid iron and nickel
What is heat transfer?	the movement of energy from a warmer object to a cooler object
Radiation is the transfer of energy	throughout space
conduction is a type of heat transfer within a material/materials that are	touching
convection is a type of heat transfer by	the movement of currents within a fluid
Why do convection currents move?	there's a temp or density difference in a material
what causes convection currents in the mantle?	heat from the core and mantle
where are the convection currents that cause earth's magnetic fields found?	outer core