Earthquakes

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**



=Earthquakes=

=Introduction= Earthquakes are a dangerous natural disaster they have distroyed many things, took many lives, And left pepole stranded with out homes. =Vocabulary= Seismic waves -A wave that carries energy relaesed by an earthquake that travels in all directions including up to the surface seismograph- A tool for recording seismic waves.

=What are seismice waves= There are three kinds of seismic waves. P-waves are the first to arrive at the surface. They are called longitude waves, S-waves are next they are transverse waves, and L-waves are a type of surface wave. these are typicly very destructive. Body waves are seismic waves that travle through Earth's interior

Faults
Thier are three different kinds of faults thier is the normal, reverce, and strike-slip. A normal fault is when crust moves apart rocks are streched until they snap wich causes one block to move down along a sloping crack. Reverce faults do the opposite of normal faults for example instead of the crust moving apart it comes closer. A strike-slip fall is when rocks grind against each other, horizontilly pass each other in opposite directions, and presser builds up along the faults until rocks break. juan, nick