Depending on the scale and also on the pressure temperature conditions where the extension is occuring there are a number of diffrent results of tension in rocks. At higher temperatures and pressures a type of ductile deformation occurs which can form structures by boudinage which causes the stretching and breakup of preexisting structures wihin the rock (see the related link for more information) to form a sausage or barrel geometry.
At shallower depths where materials behave in a brittle way, initially rocks will break "or crack" forming joints. If the tensile force continues to be applied and if it is large enough this may then generate normal faults and "horst and graben" structures. These are blocks of crust that are bounded by normal faults where the "graben" are downthrown blocks relative to the "horst", where this motion helps to accomadate the strecthing of the crust. See the realted links for more information and diagrams on this phenomenon.
If the crust continues to experience tensile stress at a high enough level for a long enough time, then ultimately a rift valley marking the creation of a new ocean and a new plate boundary will form.
Shearing affects the rocks in the earth's crust when the rocks are being pulled apart in opposite horizontal directions
The rocks will gradually get smaller
pressure builds under the plates
it gets hotter and the presure get harder
physical
tension
Tension creates normal faults, where the hanging wall moves downward relative to the footwall. This type of fault is common in divergent boundary settings when tectonic plates move away from each other, causing extension and the rocks to be pulled apart.
Stress that acts to pull materials (including rocks of the crust) apart is known as tensile stress.
Tension stress pulls rocks apart, causing them to stretch and potentially break along fractures or faults. This type of stress is common in divergent plate boundaries and areas experiencing extensional tectonic forces.
Tensile stress is the force that pulls rock apart, causing it to break or fracture. This type of stress occurs when rocks are stretched in opposite directions, leading to the formation of cracks or faults in the rock.
Tensile stress.
All rocks have cracks in them. If water fills the cracks and freezes, it expands and pushes the rock apart.
Tensional stress causes rocks to pull apart. This type of stress occurs when rocks are being pulled in opposite directions, leading to the stretching and extension of the rock mass. Over time, this can lead to the formation of faults and fractures in the rocks.
erosion can break rocks apart, weathering can also break rocks apart
us
When there is a divergent boundary, regardless if the plates are ocean-ocean or continental-continental, tensional stress pulls on the crust. Rocks have weaker tensional strength than compressive strength, so they are easier to pull apart.
When the tension (stress) is great enough, they will fracture or deform.