Earth's crust is very hard because it is made of rock. If it wasn't hard you would sink down into the Earth's core.
The crust is the outermost layer of the Earth, the shell made up of hard oceanic and continental rocks.
The Earths crust is approximately 650 km deep.
The lithosphere is composed of the hard and brittle outer shell of the Earth consisting of the crust and the uppermost mantle.
The sudden vibration in the plates inside the crust causes the earths crust to rise & fall.
mantle
The earth's crust is not stress
half of earths layer
continental crust
The earth's crust is generally solid.
The crust is the thinnest part on the Earth.
crust
the crust and the core