A fault.
Focus
This is called a fault.== ==
the mantel of earths crust will break causing an eartqake
The layer of solid unbroken rocks in the Earth's crust is called the lithosphere.
A fault is a break in the Earth's crust where rocks can slide past each other due to tectonic forces.
the crust and the core
iron and magnesium
A break in the earth's crust is called a fault line.
it is made of rocks
Basalt and limestone.
The point in the Earth's crust where rocks first break and move is called the "focus" or "hypocenter" of an earthquake. It is the location where the accumulated stress exceeds the strength of the rocks, causing them to fracture and release energy in the form of seismic waves. The point directly above the focus on the Earth's surface is known as the "epicenter." Understanding these points is crucial for studying and predicting seismic activity.
This process is called "faulting," where rocks break and slide against each other due to tectonic forces, creating faults in the Earth's crust.