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The crust is the upper layer of the earth. It is where the movement of plates occur due to which earthquakes occur. The Earth's crust is a thin layer of rock, like skin on an apple.
tectonic plates
Well tectonic plates can sometimes be in volcanic areas. But mostly not. --I think volcanoes usually occur on hotspots in the Earth's outer layer--
Earthquakes occur in the crust (solid rock) layer.
The crust
Volcanic eruptions occur only in certain places and do not occur randomly. That's because the Earth's outermost shell -- the lithosphere -- is broken into a series of slabs known as lithospheric ortectonic plates. These plates are rigid, but they float on the hotter, softer layer in the Earth's mantle. There are 16 major plates. As the plates move about, they spread apart, collide, or slide past each other. Volcanoes occur most frequently at plate boundaries.
the crust- most outer layer of earth
A tornado would occur in the troposphere, the layer closest to the Earth.
mantle
Faults occur near plate boundaries because the earth is weaker there... The magma under the Earth's crust makes the plates move very slowly and sometimes two plates can crash into each other causing the ground to shake.
The mantle or perhaps you are referring to the asthenosphere, the upper layer of the earth's mantle, below the lithosphere, in which there is relatively low resistance to plastic flow and convection is thought to occur.