Fracture (geology) facts for kids
In geology, a fracture is any kind of separation or break in a rock formation. Examples are joints or faults. These divides the rock into two or more pieces. A fracture can sometimes form a deep, wide crack in the rock. They are usually caused when the rock is not strong enough to hold up under too much stress. This makes the rock crack along its weakest point. Fractures can provide access for fluids, like water or hydrocarbons, to move into the rock.
Images for kids
Cartoon examples of common tensile fracture mechanisms in laboratory rock samples. A) Axial stretching: tension is applied far from the crack. B) Hydraulic fracturing: tension or compression is applied far away from the crack and fluid pressure increases, causing tension on the face of the cracks. C) Brazilian disc test: applied compressive loads parallel to the crack cause the sides of the disk to bulge out and tension to occur on the crack faces.
The concentric circles in this sandstone are "plumose" (plume-like) structures that can form during the formation and propagation of a fracture
Fracture (geology) Facts for Kids. Kiddle Encyclopedia.