What is the major ingredient in a magma that determines whether it has high or low viscosity group of answer choices?
The higher the temperature of the magma, the lower its viscosity. Partial melting occurs when part of a rock melts and part remains solid. Magma is more dense than solid rock and therefore rises against the weight of the overlying rock.
What is the minimum number of location data points needed in order to determine the location of the epicenter of an earthquake?
three different In order to determine the location of an earthquake epicenter, seismographs from at least three different places are needed for a particular event.
Where do the largest & most powerful earthquakes tend to occur quizlet?
The zone of greatest seismic activity is called the circum-Pacific belt, encompassing the coastal region of Chile, Central America, Indonesia, Japan, and Alaska, including the Aleutian Islands. What type of plate boundary is associated with Earth's largest earthquakes?
What are primary effects of earthquake damage those that cause direct damage to buildings infrastructure and the landscape )? Group of answer choices?
The effects from earthquakes include ground shaking, surface faulting, ground failure, and less commonly, tsunamis.
What determines the viscosity of magma?
Viscosity of Magmas Viscosity is the resistance to flow (opposite of fluidity). Viscosity depends on primarily on the composition of the magma, and temperature. Higher SiO2 (silica) content magmas have higher viscosity than lower SiO2 content magmas (viscosity increases with increasing SiO2 concentration in the magma).
What are the two primary factors that determine how magma erupts?
The two primary factors that determine how magma erupts is its viscosity and gas content.
Which feature of the seismogram above would be measured to help determine the location of the epicenter of an earthquake?
triangulation: To determine the location of an earthquake the distance of the earthquake must be determined from at least three seismic recording stations. Circles with the appropriate radius are then drawn around each station. The intersection of three circles uniquely identifies the earthquake epicenter.
What is the importance of determining the location of the earthquake epicenter?
Locating the epicenter It is important to people hearing the reports of a major earthquake to know approximately where the earthquake is located. Scientists know people can get a better understanding where an earthquake occurred if they give the information relative to towns and cities in an area.
Where do the largest earthquakes occur group of answer choices mid ocean ridges continental rifts subduction zones transform fault zones continental collisions?
Convergent Plate Boundaries: Subduction zone: Where an oceanic plate collides with another plate, one plunges into the interior and the other overrides. The largest earthquakes ever recorded have occurred at subduction zones.
Which plate boundary type along the circum-Pacific belt is responsible for the majority of that belt’s earthquakes?
Answer and Explanation: The plate boundary that is responsible for the majority of the Circum-Pacific Belt's earthquakes is called the Ring of Fire. It is a horse-shoe shaped…
What is the main cause of earthquakes and volcanic eruptions?
Both volcanoes and earthquakes occur due to movement of the Earth's tectonic plates. They are both caused by the heat and energy releasing from the Earth's core. Earthquakes can trigger volcanic eruptions through severe movement of tectonic plates.
What factors affect the earthquake and volcanic activity?
Most volcanoes and earthquakes are caused by the motion and inter- action of Earth's plates. here, Earth's plates are in contact with one another and can slide beneath each other. The way Earth's plates interact at boundaries is an important factor in the locations of earthquakes and volcanoes.
Which component of magma is the highest and the lowest in value?
Felsic MagmaFelsic magma has the highest silica content of all magma types, between 65-70%. As a result, felsic magma also has the highest gas content and viscosity, and lowest mean temperatures, between 650o and 800o Celsius (1202o and 1472o Fahrenheit).
What are the two major factors that influence the viscosity of magma lava?
The viscosity of magma depends upon its silica content and temperature.
Which of the following increases the viscosity of magma quizlet?
The viscosity of magma increases with: high % silica and cooler temperatures.
Which characteristic of magma highly determines its explosiveness?
Viscosity Viscosity, together with the amount of gas dissolved in magma, can determine the explosivity of the eruption. More viscous magma with volatiles is more explosive than less viscous magma, where gases can bubble out relatively easily.
What is seismograph and seismogram?
A seismometer is the internal part of the seismograph, which may be a pendulum or a mass mounted on a spring; however, it is often used synonymously with "seismograph". Seismographs are instruments used to record the motion of the ground during an earthquake.
What does a seismogram measure?
Seismograms are used to determine the location and magnitude of earthquakes. An earthquake's magnitude may be considered to vary as a function of the amount of energy released at the rupture point.
How do scientists determine the location of an earthquake?
Triangulation can be used to locate an earthquake. The seismometers are shown as green dots. The calculated distance from each seismometer to the earthquake is shown as a circle. The location where all the circles intersect is the location of the earthquake epicenter.
What factor determines the strength of an earthquake the depth of its?
The strength of shaking from an earthquake diminishes with increasing distance from the earthquake's source, so the strength of shaking at the surface from an earthquake that occurs at 500 km deep is considerably less than if the same earthquake had occurred at 20 km depth.
How do you think the distribution of earthquake epicenters active volcanoes and earthquake epicenters relate to the division of tectonic plates?
The distribution of the volcanoes, earthquake epicenters, and major mountain belts are distributed in close proximity of the borders of the tectonic plates. Most of the active volcanoes nowadays are found at the so called ''Ring of Fire'' which is practically the border of the Pacific Tectonic Plate.
Which statement does best describe the location of the majority of earthquake epicenters related to the location of volcanoes around the world?
If an earthquake begins while you are in a building, the safest thing for you to do is ______. Why is it important to be aware of places prone to earthquakes? Which statement BEST describes the location of majority of earthquake epicenters relative to the location of volcanoes around the world? They are far adjacent.
Why the Circum-Pacific Belt is a major earthquake zone?
The belt exists along boundaries of tectonic plates, where plates of mostly oceanic crust are sinking (or subducting) beneath another plate. Earthquakes in these subduction zones are caused by slip between plates and rupture within plates. Earthquakes in the circum-Pacific seismic belt include the M9.
Which of the following determines how easily magma flows?
Both the temperature and mineral content of magma affect how easily it flows. The viscosity (thickness) of the magma that erupts from a volcano affects the shape of the volcano. Volcanoes with steep slopes tend to form from very viscous magma, while flatter volcanoes form from magma that flows easily.
What is the indicator of a volcanic eruption?
An increase in the frequency and intensity of felt earthquakes. Noticeable steaming or fumarolic activity and new or enlarged areas of hot ground. Subtle swelling of the ground surface. Small changes in heat flow.
What factor can help determine earthquakes strength?
The Richter magnitude of an earthquake is determined from the logarithm of the amplitude of waves recorded by seismographs. Adjustments are included for the variation in the distance between the various seismographs and the epicenter of the earthquakes.
What factor determines the strength of an earthquake the depth of it?
When an earthquake strikes, the intensity of earthquake shaking determines the severity of damage. In turn, the main factors affecting earthquake shaking intensity are earthquake depth, proximity to the fault, the underlying soil, and building characteristics—particularly height.
What is the major ingredient of magma?
The major ingredient in magma is silica (50- 70%), a compound made up of particles of the elements oxygen and silicon. The amount of silica in magma helps to determine its viscosity. The more silica magma contains, the higher its viscosity.
What is the major component of magma?
Oxygen, the most abundant element in magma, comprises a little less than half the total, followed by silicon at just over one-quarter. The remaining elements make up the other one-quarter. Magmas derived from crustal material are dominated by oxygen, silicon, aluminum, sodium, and potassium.
What factors affect viscosity of magma quizlet?
VISCOSITY is directly related to the amount of silica (sand) in the magma. As silica content increases, viscosity increases. The magma slows down. WATER CONTENT is inversely related to viscosity.