The existing layer will aventually sink and when a volcano or something erupts, it becomes solid and replaces the old crust.
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Earth's crust can suddenly change due to natural events like earthquakes, volcanic eruptions, landslides, or meteorite impacts. These events can cause rapid movements and deformations in the Earth's crust, leading to sudden changes in topography and landforms.
crust
When mass is added to Earth's crust, it causes the crust to subside and sink due to the increased weight. Conversely, when mass is removed from the crust, it can rebound and rise due to the decreased load. This process is known as isostatic adjustment and can result in changes in the Earth's topography.
A strike-slip fault occurs when two blocks of the Earth's crust slide horizontally past each other. Stress builds up along the fault as the blocks try to move past each other, causing them to suddenly release energy in the form of an earthquake when they finally slip. The sudden release of energy sends seismic waves through the Earth, leading to ground shaking and potential damage at the surface.
A fault
Another word for Earth's outer surface is "crust."