Transistion zones.
I think there is a layer called the Gutenberg Discontinuity named after a german seismologist named Beno Gutenberg between lower mantle and outer core.
Plate boundaries.
its called the mantle
Tectonic activities, (Earths internal movements).
fat trees
Lava....when its under the earths crust its called magma.
After the mantle, the next and last layer of the earths internal structure is the core, but the only sort of barrier that exists is a kind of transistion zone that serves as a linkage between the two layers.
The Earths internal heat.
Subsidence.
a total eclipse
Yes it is called Lunar Eclipse. And when Moon comes in between earth and sun, its called the Solar Eclipse.
Once magma breaks through the earths crust it is called"lava"