What does hierarchical society mean?

Atriangle has a side lengths of 18cm, 80 cm and 81cm. classify it as acute obtuse or right?

"water seeps into rock cracks and dissolved minerals there. the solution travels through cracks in the. eventually concentrating into large crystals." which process is that

As heat and pressure increase, ductile deformation becomes less likely becomes more likely is replaced by elastic deformation stops occurring