Rarely a serious problem. Look-alikes: Jumping oak gall, tubakia leaf spot, oak leaf blister, other fungal leaf spots. Jumping oak gall Brown leaves appear on trees in the white oak group in late spring. Severe infections may cause the leaves to turn black, curl up and fall. On the underside are brown galls with the larva of a small wasp inside.
Volcanoes form when magma reaches the Earth's surface, causing eruptions of lava and ash. They occur at destructive (compressional) and constructive (tensional) plate boundaries. The immediate effects of volcanic eruptions can be devastating, but they may be beneficial in the long term.
Volcanic mountain ranges are formed from oceanic-continental convergent-subduction boundaries, much like with volcanic islands. When a plate is subducted, the crust forming th â¦ is plate is heated and melted creating magma which erupts from the crust and creates volcanic mountain ranges.1 person found this useful.olcanic mountain ranges are formed from oceanic-continental convergent-subduction boundaries, much like with volcanic islands. When a plate is subducted, the crust forming th â¦ is plate is heated and melted creating magma which erupts from the crust and creates volcanic mountain ranges. 1 person found this useful.