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.
Answer by Jake Weatherby. Confidence votes 83.5K. Hot spot volcanoes such as those in Hawaii and the Yellowstone Caldera form as a result of extra hot material rising from deep within the mantle. While most volcanoes can only form near plate boundaries, hot spot volcanoes can form in the middle of a tectonic plate.Unlike at subduction zones, which are generally associated with stratovolcanoes, hot spots that form under oceanic crust typically produce shield volcanoes.nswer by Jake Weatherby. Confidence votes 83.5K. Hot spot volcanoes such as those in Hawaii and the Yellowstone Caldera form as a result of extra hot material rising from deep within the mantle. While most volcanoes can only form near plate boundaries, hot spot volcanoes can form in the middle of a tectonic plate.