Which area of europe was known as the "powder keg" of europe prior to the outbreak of world war 1

Arrange the events in the order with they occured.

Which statements explain reasons why unconformities occur? check all that apply. rocks along a fault break and move. igneous rock forms at earth’s surface. rocks erode and sediment is deposited. no sediment is deposited over a long time. igneous rock forms between sedimentary layers.

Explain when conformity is beneficial and when it is harmful. give examples of both?