dictionary

earthquake: a series of vibrations induced in __[|the] __ earth's crust by theabrupt rupture and rebound of rocks in which elastic strainhas been slowly accumulating. volcano : a mountain or hill, usually having a cuplike crater <span style="color: #333333; font-family: Verdana,Arial,Helvetica,sans-serif; font-size: 13px; line-height: 1.25em; margin: 0px; padding: 0px; position: static;">at thesummit, formed <span style="color: #333333; font-family: Verdana,Arial,Helvetica,sans-serif; line-height: 16px;"><span style="color: #333333; font-family: Verdana,Arial,Helvetica,sans-serif; font-size: 13px; line-height: 1.25em; margin: 0px; padding: 0px; position: static;">around such a <span style="background-color: transparent; color: #333333; cursor: default; font-family: Verdana,Arial,Helvetica,sans-serif; font-size: 13px; line-height: 1.25em; margin: 0px; padding: 0px; position: static;">vent from the ash and lava <span style="color: #333333; font-family: Verdana,Arial,Helvetica,sans-serif; font-size: 13px; line-height: 1.25em; margin: 0px; padding: 0px; position: static;">expelled through it. <span style="color: #0000ff; font-family: Verdana,Arial,Helvetica,sans-serif; font-size: 13px; line-height: 1.25em; margin: 0px; padding: 0px; position: static;">ring of fire: <span style="font-family: Arial,Verdana,sans-serif; line-height: normal;">The Ring  of  Fire , or the Pacific  Ring  of  Fire  , is a 40,000 km (25,000 mi) stretch of geologically active land extending in a [|horseshoe] shape around the Pacific Rim. The Ring  of  Fire  gets its name from the numerous volcanoes and [|earthquakes] it is the pacific ocean <span style="color: #0000ff; font-family: arial,helvetica,sans-serif; line-height: 19px;"> Fault: Faults are fractures or fracture zones in the Earth's crust along which one side moves with respect to the other. A fault scarp is a cliff or steep slope that sometimes forms along the fault at the surface. There are many types of faults (for example, strike-slip, normal, reverse, and thrust faults) ranging in size from a few tens of meters to hundreds of kilometers in dimension. <span style="color: #0000ff; font-family: arial,helvetica,sans-serif; font-size: 13px; line-height: 19px;">seismologist: <span style="font-family: Verdana,Arial,Helvetica,sans-serif; line-height: normal;">Seismologists are Earth scientists, specialized in geophysics, who study the genesis and the propagation of seismic waves in geological materials. These geological materials can range from a laboratory sample to the Earth as a whole, from its surface to its core. seismograph:﻿ ﻿ <span style="font-family: Arial,Helvetica,sans-serif; line-height: 18px;">A **<span style="border: 0px initial initial; font-family: Arial,Helvetica,sans-serif; margin: 0px; padding: 0px; vertical-align: baseline;">seismograph ** is the device that scientists use to measure <span style="background-color: #ffffff; color: #0000ff; font-family: arial,helvetica,sans-serif; line-height: 19px;"> seismic waves: are <span style="background-attachment: initial; background-clip: initial; background-color: initial; background-image: none; background-origin: initial; background-position: initial initial; background-repeat: initial initial; color: #0645ad; text-decoration: none;">[|waves] of energy that travel through the earth, aftershock: Aftershocks are earthquakes that follow the largest shock of an earthquake sequence. They are smaller than the mainshock and within 1-2 rupture lengths distance from the mainshock. Aftershocks can continue over a period of weeks, months, or years. In general, the larger the mainshock, the larger and more numerous the aftershocks, and the longer they will continue. volcano: <span style="color: #333333; font-family: Verdana,Arial,Helvetica,sans-serif; line-height: 16px;"><span style="background-color: transparent; color: #333333; cursor: default; font-family: Verdana,Arial,Helvetica,sans-serif; font-size: 13px; line-height: 1.25em; margin-bottom: 0px; margin-left: 0px; margin-right: 0px; margin-top: 0px; padding-bottom: 0px; padding-left: 0px; padding-right: 0px; padding-top: 0px; position: static;">a vent in __<span style="color: #333333; font-family: Verdana,Arial,Helvetica,sans-serif; font-size: 13px; line-height: 1.25em; margin-bottom: 0px; margin-left: 0px; margin-right: 0px; margin-top: 0px; padding-bottom: 0px; padding-left: 0px; padding-right: 0px; padding-top: 0px;">[|the] __<span style="color: #333333; font-family: Verdana,Arial,Helvetica,sans-serif; font-size: 13px; line-height: 1.25em; margin-bottom: 0px; margin-left: 0px; margin-right: 0px; margin-top: 0px; padding-bottom: 0px; padding-left: 0px; padding-right: 0px; padding-top: 0px; position: static;"> <span style="background-color: transparent; color: #333333; cursor: default; font-family: Verdana,Arial,Helvetica,sans-serif; font-size: 13px; line-height: 1.25em; margin-bottom: 0px; margin-left: 0px; margin-right: 0px; margin-top: 0px; padding-bottom: 0px; padding-left: 0px; padding-right: 0px; padding-top: 0px; position: static;">earth's crust through <span style="color: #333333; font-family: Verdana,Arial,Helvetica,sans-serif; font-size: 13px; line-height: 1.25em; margin-bottom: 0px; margin-left: 0px; margin-right: 0px; margin-top: 0px; padding-bottom: 0px; padding-left: 0px; padding-right: 0px; padding-top: 0px; position: static;">which <span style="color: #333333; cursor: default; font-family: Verdana,Arial,Helvetica,sans-serif; font-size: 13px; line-height: 1.25em; margin-bottom: 0px; margin-left: 0px; margin-right: 0px; margin-top: 0px; padding-bottom: 0px; padding-left: 0px; padding-right: 0px; padding-top: 0px; position: static;">lava, <span style="background-color: transparent; color: #333333; cursor: default; font-family: Verdana,Arial,Helvetica,sans-serif; font-size: 13px; line-height: 1.25em; margin-bottom: 0px; margin-left: 0px; margin-right: 0px; margin-top: 0px; padding-bottom: 0px; padding-left: 0px; padding-right: 0px; padding-top: 0px; position: static;">steam, <span style="color: #333333; font-family: Verdana,Arial,Helvetica,sans-serif; font-size: 13px; line-height: 1.25em; margin-bottom: 0px; margin-left: 0px; margin-right: 0px; margin-top: 0px; padding-bottom: 0px; padding-left: 0px; padding-right: 0px; padding-top: 0px; position: static;">ashes,etc., are expelled, <span style="color: #333333; font-family: Verdana,Arial,Helvetica,sans-serif; font-size: 13px; line-height: 1.25em; margin-bottom: 0px; margin-left: 0px; margin-right: 0px; margin-top: 0px; padding-bottom: 0px; padding-left: 0px; padding-right: 0px; padding-top: 0px; position: static;"><span style="color: #333333; font-family: Verdana,Arial,Helvetica,sans-serif; font-size: 13px; line-height: 1.25em; margin-bottom: 0px; margin-left: 0px; margin-right: 0px; margin-top: 0px; padding-bottom: 0px; padding-left: 0px; padding-right: 0px; padding-top: 0px; position: static;"> either <span style="background-color: transparent; color: #333333; cursor: default; font-family: Verdana,Arial,Helvetica,sans-serif; font-size: 13px; line-height: 1.25em; margin-bottom: 0px; margin-left: 0px; margin-right: 0px; margin-top: 0px; padding-bottom: 0px; padding-left: 0px; padding-right: 0px; padding-top: 0px; position: static;">continuously or at irregular <span style="color: #333333; font-family: Verdana,Arial,Helvetica,sans-serif; font-size: 13px; line-height: 1.25em; margin-bottom: 0px; margin-left: 0px; margin-right: 0px; margin-top: 0px; padding-bottom: 0px; padding-left: 0px; padding-right: 0px; padding-top: 0px; position: static;">intervals. vents: <span style="-webkit-border-horizontal-spacing: 5px; -webkit-border-vertical-spacing: 5px; border-collapse: collapse; font-family: 'Times New Roman',Verdana,Arial,Helvetica,sans-serif; font-size: medium; line-height: normal;">Volcanic vents are openings in the crust, usually within the crater of a volcano <span style="-webkit-border-horizontal-spacing: 5px; -webkit-border-vertical-spacing: 5px; border-collapse: collapse; color: #0000ff; font-family: 'Times New Roman',Verdana,Arial,Helvetica,sans-serif; font-size: medium; line-height: normal;">erupts: <span style="-webkit-border-horizontal-spacing: 2px; -webkit-border-vertical-spacing: 2px; font-family: Arial,Helvetica; font-size: small; line-height: normal;">