layers of the earth Flashcards
What are the 2 types of layers of the earth?
compositional and mechanical
what are the 3 types of compositional layers?
crust, mantle, and core`
what makes up 30% of the earths crust
continental crust
what is 3x thinner than the continental crust and takes up 70% of the crust?
oceanic crust
what is the oceanic crust made up of?
basalt (silicate magnesium /sima)
what is the continental crust made up of?
granite (silicate aluminium)
is the continental crust denser than the oceanic crust?
no
is the oceanic crust thinner than the continental crust
yes
the oceanic crust has younger rocks because?
because the magma from the mantle seeps into the crust therefore creating tectonic plate activity
what do you call the discontinuity between the mantle and the core?
Gutenberg discontinuity
what do you call the discontinuity between the 2 cores?
lehmann discontinuity
what do you call the discontinuity between the crust and the mantle?
Mohorovicic discontinuity
what is the earths mantle made of ?
ferro-magnesium silicate
what do you call it when the molten rocks turn into magma then seeps into the crust
mantle convection
normal temp of the mantle and the hottest it can get?
900C-1,000C and 3,700C
upper and lower mantle difference
the upper is malleable while the lower is ductile. the upper is mostly solid while the lower is semi-liquid.
what is the core made up of ?
iron and nickel
outer core is solid or liquid?
liquid
inner core’s temp can reach?
5k to 6k celsius
outer core’s temp can reach?
3.7k to 4.3k celsius
what are the 3 mechanical layers?
asthenosphere, lithosphere, and mesosphere
