A fault.
A fault is a break in the Earth's crust where pieces of the crust move relative to each other. This movement can cause earthquakes as stress builds up along the fault line and is released suddenly. Faults are common in regions where tectonic plates interact and are essential for understanding earthquake hazards.
normal fault
Fault.
A fault
Other orbiting bodies contain more iron then earths crust does
Shooting seismic waves into the planet
the large sections of the earth's crust that move relative to each other
The fracture along blocks of crust (tectonic plates) is called a "fault" or "fault line".
It consist of large sections called tectonic plates, which move relative to each other.
Folds and faults are both formed from compression on opposite sides due to tectonic movement of the earth's crust. However, in a fold, the crust does not break, it simply is deformed in a curved pattern. In a fault, the rocks in the crust actually shatter, and movement is seen along a fault line, wheby rocks are displaced relative to each other.
fault block
Large blocks of Earth's crust that drops down relative to other blocks, will form a rift valley (trench). The Great Rift Valley in Africa is one example.