The internal structures of the terrestrial planets (How do we know?…
The internal structures of the terrestrial planets
The origin of planets
Condensation of the solar nebula
Accretion process begins
Formation of planetesimals
Accretion of planetary embryos
Impact of planetary embryos
Differentiation of planetary embryos
How do we know?
Xenoliths (mening strange rocks) are brought up from depths during volcanic erruptions
Mean density of the Earth can be calculated
P (longitudinal) and s (transverse waves) can be measured from opposite sides of the planet. P waves travel through everything, s waves only solids. S waves can not get through the core
Earth has a magnetic field which shouldn't be possible as there is no SOLID above 1200 degrees with magnetic properties. The core must then be partially liquid.
Heating a planet
Impacts on a planet are still common. Earth recycles the crust with volcanic action.