Geology year 8 Flashcards
Preparation for geology test
Faults
Cracks where rocks break and move past each other
Folds
Bends in rock layers due to stress
Boundary
Line separating different tectonic plates
Anticline
Fold where oldest rock layers are at the core, arched upward
Syncline
Fold where youngest rock layers are at the core, arched downward
Deformation
Process where rocks change shape under stress
Folding
Bending of rock layers under stress
Fault blocks
Blocks of rock on either side of a fault
Strike-slip fault
Fault where blocks move past each other horizontally
Normal fault
Fault where hanging wall moves down relative to footwall
Reverse fault
Fault where hanging wall moves up relative to footwall
Fault plane
Location where two fault blocks meet
Hanging wall
Block above the fault plane
Footwall
Block below the fault plane
Elastic Deformation
Reversible strain in material
Ductile Deformation
Irreversible strain in material
Fracture Deformation
Irreversible strain leading to material breakage
Orogeny
Formation of mountain ranges by crustal displacement
Fault
Break or crack where tectonic plates move
Fold
Bending of rock layers due to plate movement
Brittle
Rock’s tendency to break under stress
Plastic
Rock’s ability to deform without breaking
Compression
Stress causing rocks to be squeezed together
Tension
Stress causing rocks to be pulled apart