You're thinking of magma.
There are almost no extrusive rocks on the earths surface because they are all under the earths surface. They are mainly lower than the earths surface.
Yes it is call a crust 😁
fre
That there are hot spots concisting of gas under the earths surface.
There is no actual name for a solid and liquid. An item can be a solid and liquid, but that is only under different pressures. For instance: The iron that makes up the Earths core is a solid, but that same material that is found in the Earths upper mantel is a liquid. This is because of the pressure differences
mantle
There are almost no extrusive rocks on the earths surface because they are all under the earths surface. They are mainly lower than the earths surface.
the moving of the plates under the earths surface
pressure from the heat under the earths surface
There is no ladder if (of?) rocks under the earths surface, your question is meaningless.
An intrusion.
the tectonic plates are shifting under the earths surface.
it's so thick because there is more rock and dart.
the tectonic plates under the earths surface
Lava
An earthquake is started when two plates (which lie under the Earths surface) rub together this creates movement which then sometimes pulls/pushes at the earths surface and creates giant cracks in the earths surface... and that is how an earthquake is started.
earthquakes