Volcanoes+4

Standard: 1. Plate tectonics accounts for important features of Earth’s surface and major geologic events. As a basis for understanding this concept: a. Students know evidence of plate tectonics is derived from the fit of the continents; the location of earthquakes, volcanoes, and midocean ridges; and the distribution of fossils, rock types, and ancient climatic zones. d. Students know that earthquakes are sudden motions along breaks in the crust called faults and that volcanoes and fissures are locations where magma reaches the surface. e. Students know major geologic events, such as earthquakes, volcanic eruptions, and mountain building, result from plate motions. f. Students know how to explain major features of California geology (including mountains, faults, volcanoes) in terms of plate tectonics. g. Students know how to determine the epicenter of an earthquake and know that the effects of an earthquake on any region vary, depending on the size of the earthquake, the distance of the region from the epicenter, the local geology, and the type of construction in the region.
 * Plate Tectonics and Earth’s Structure**

=**VOLCANOES**=

INSIDE VOLCANOES
==A volcano is an opening in the Earth's crust. Beneath them, they have magma,hot gases,ash,and rock fragments.When the magma bursts out of a volcano,it becomes lava.Lava can be hotter than 2000 F .Different types of materials can burst out of a volcano as well.Like rock fragments,dust,ash, steam,and gases.==

TYPES OF VOLCANOES
==Some types of volcanoes are Cinder Cone volcanoes,Composite Volcanoes,and Shield Volcanoes. Cinder Cone volcanoes have slopes mostly made of rocks and ash.They are the smallest kind of volcanoes. The next type of volcano is the Composite Volcano. They are composed of alternating layers of lava and ash.They are cone-shaped, and have steep slopes. Shield Volcanoes have gentle slopes. They are almost made entirely of layer upon layer of lava.==

EFFECTS OF VOLCANO ERUPTIONS
==Volcanic eruptions are very dangerous for everyone living near them.They can set fires,expel hot and poisonous gases,kill wild life, and even destroy whole cities.Records of destructive volcanoes go back thousands of years.But they have some helpful results.Volcanic eruptions can also change Earth's surface. An axample is the the island of Hawaii.==

CONCLUSION
==In conclusion, I think that volcanoes are very dangerous and that they are very important for the developement of the Earth's surface.And that people will have to be more cautious with volcano eruptions in the future.== =Eruption of a volcano =