Earth Science
... 16. The heating of underground water by magma. 17. An area where magma from deep within the mantle melts through the crust above it. 18. The pocket beneath a volcano where magma collects. 19. A material found in magma that is formed from the elements oxygen and silicon. 20. A tall, cone-shaped mount ...
... 16. The heating of underground water by magma. 17. An area where magma from deep within the mantle melts through the crust above it. 18. The pocket beneath a volcano where magma collects. 19. A material found in magma that is formed from the elements oxygen and silicon. 20. A tall, cone-shaped mount ...
Directed Reading
... b. the distance from the top of the volcano to its base. c. the viscosity of magma. d. the geologic age of the volcano. ...
... b. the distance from the top of the volcano to its base. c. the viscosity of magma. d. the geologic age of the volcano. ...
Volcanoes and Other Igneous Activity
... Other volcanic landforms • Volcanic pipes and necks – Pipes are short conduits that connect a magma chamber to the surface – Volcanic necks (e.g., Ship Rock, New Mexico) are resistant vents left standing after erosion has removed the volcanic cone ...
... Other volcanic landforms • Volcanic pipes and necks – Pipes are short conduits that connect a magma chamber to the surface – Volcanic necks (e.g., Ship Rock, New Mexico) are resistant vents left standing after erosion has removed the volcanic cone ...
view the Lecture Presentation
... Blocks and bombs – Apple to refrigerator-sized. Bombs – Streamlined fragments of ejected lava. ...
... Blocks and bombs – Apple to refrigerator-sized. Bombs – Streamlined fragments of ejected lava. ...
Volcanoes/REVIEW
... Indicate whether the sentence or statement is true or false. If false, change the underlined word or phrase to make the sentence true. ____ 1. Liquid magma flows upward through the crust because it is less dense than the solid material around it. ____ 2. A hot spring is hot water and steam that eru ...
... Indicate whether the sentence or statement is true or false. If false, change the underlined word or phrase to make the sentence true. ____ 1. Liquid magma flows upward through the crust because it is less dense than the solid material around it. ____ 2. A hot spring is hot water and steam that eru ...
What mainly controls eruptive style? Viscosity in magma 2. Eruptive
... Shield Volcano (typically basaltic!) ...
... Shield Volcano (typically basaltic!) ...
Document
... vent and breaks into drops. These drops harden into cinders that form a steep cone around the vent. ...
... vent and breaks into drops. These drops harden into cinders that form a steep cone around the vent. ...
Shield Volcano
... • Composite volcanoes have very violent eruptions with viscous lava flows & layers of tephra, or rock fragments (Describe the eruption) ...
... • Composite volcanoes have very violent eruptions with viscous lava flows & layers of tephra, or rock fragments (Describe the eruption) ...
Chapter 12
... Cinder cone: steep-sloped, made of tephra, explosive, granitic lava, high silica, high trapped gases. Krakatoa. ...
... Cinder cone: steep-sloped, made of tephra, explosive, granitic lava, high silica, high trapped gases. Krakatoa. ...
Volcano Glossary III
... A substance that has no crystal structure, formed by rapid cooling of magma. Glass of basaltic composition is also called sideromelane, whereas glass of granitic or rhyolitic composition is called obsidian. ...
... A substance that has no crystal structure, formed by rapid cooling of magma. Glass of basaltic composition is also called sideromelane, whereas glass of granitic or rhyolitic composition is called obsidian. ...
Volcanoes
... Plug: mass of solid lava that blocks a volcano’s vent. Geothermal energy: power made from heat within the Earth. Geyser: fountain of hot water and steam erupting from the ground in a volcanic area. ...
... Plug: mass of solid lava that blocks a volcano’s vent. Geothermal energy: power made from heat within the Earth. Geyser: fountain of hot water and steam erupting from the ground in a volcanic area. ...
Volcanoes - Travelling across time
... The formation of volcanoes 1. Magma rises through cracks or weaknesses in the Earth's crust. 2. Pressure builds up inside the Earth. 3. When this pressure is released, eg as a result of plate movement, magma explodes to the surface causing a volcanic eruption. 4. The lava from the eruption cools to ...
... The formation of volcanoes 1. Magma rises through cracks or weaknesses in the Earth's crust. 2. Pressure builds up inside the Earth. 3. When this pressure is released, eg as a result of plate movement, magma explodes to the surface causing a volcanic eruption. 4. The lava from the eruption cools to ...
Volcanoes
... Dormant- are not currently erupting but are considered likely to do so. Mt. St Helens was dormant for 123 years before it erupted in 1980. ...
... Dormant- are not currently erupting but are considered likely to do so. Mt. St Helens was dormant for 123 years before it erupted in 1980. ...
Types of Volcanoes Dangers from Composite Cones Pyroclastic
... Viscosity = a substance’s resistant to flow The viscosity of magma as it rises inside the volcano can affect the type of eruption. ...
... Viscosity = a substance’s resistant to flow The viscosity of magma as it rises inside the volcano can affect the type of eruption. ...
Topic 8 Volcanoes
... The photograph above shows a dike composed of a dark band of basaltic rock which cuts across the lighter layers of gneiss. This dike is located on the west side of the Palisades Interstate Parkway in New Jersey. ...
... The photograph above shows a dike composed of a dark band of basaltic rock which cuts across the lighter layers of gneiss. This dike is located on the west side of the Palisades Interstate Parkway in New Jersey. ...
VOLCANO’S ACTIVITY
... forces are at work. These forces move lithospheric plates and produce huge chambers of magma, molten rock beneath the Earth crust. ...
... forces are at work. These forces move lithospheric plates and produce huge chambers of magma, molten rock beneath the Earth crust. ...
Composite Volcano or Stratovolcano
... a bottle of carbonated water vigorously, and then quickly removing the cap. The shaking action nucleates the dissolution of CO2 from the liquid as bubbles, increasing the internal volume. The gases and water gush out with speed and force.[3] Two Decade Volcanoes that erupted in 1991 provide examples ...
... a bottle of carbonated water vigorously, and then quickly removing the cap. The shaking action nucleates the dissolution of CO2 from the liquid as bubbles, increasing the internal volume. The gases and water gush out with speed and force.[3] Two Decade Volcanoes that erupted in 1991 provide examples ...
HST_CRF_04_02_03.qxd
... Directed Reading B Section: Volcanic Eruptions Circle the letter of the best answer for each question. ...
... Directed Reading B Section: Volcanic Eruptions Circle the letter of the best answer for each question. ...
Volcano and extrusive igneous rock notes
... translations result in deep gaps that (perhaps) generate decompression melting(?) Extrusive igneous rock types (simplified for the purposes of this course) • rhyolite - same composition as intrusive rock "granite" - pink potassium feldspar, sodium feldspar, quartz, amphibole - silica rich - crystall ...
... translations result in deep gaps that (perhaps) generate decompression melting(?) Extrusive igneous rock types (simplified for the purposes of this course) • rhyolite - same composition as intrusive rock "granite" - pink potassium feldspar, sodium feldspar, quartz, amphibole - silica rich - crystall ...
Volcanism and Its Landforms - Cal State LA
... because of their composition – Higher viscosity magmas typically have higher silica content and produce explosive eruptions • Pyroclastics – solid fragments erupted from a volcano ...
... because of their composition – Higher viscosity magmas typically have higher silica content and produce explosive eruptions • Pyroclastics – solid fragments erupted from a volcano ...
Presentation
... •built up of alternating layers of rock and lava •explosive eruptions at first with tephra, then quiet with lava •forms large, cone-shaped mountains •made of grantic and basaltic magma ...
... •built up of alternating layers of rock and lava •explosive eruptions at first with tephra, then quiet with lava •forms large, cone-shaped mountains •made of grantic and basaltic magma ...
32 - Cal State LA - Instructional Web Server
... because of their composition – Higher viscosity magmas typically have higher silica content and produce explosive eruptions • Pyroclastics – solid fragments erupted from a volcano ...
... because of their composition – Higher viscosity magmas typically have higher silica content and produce explosive eruptions • Pyroclastics – solid fragments erupted from a volcano ...
Mono–Inyo Craters
The Mono–Inyo Craters are a volcanic chain of craters, domes and lava flows in Mono County, Eastern California, United States. The chain stretches 25 miles (40 km) from the northwest shore of Mono Lake to the south of Mammoth Mountain. The Mono Lake Volcanic Field forms the northernmost part of the chain and consists of two volcanic islands in the lake and one cinder cone volcano on its northwest shore. Most of the Mono Craters, which make up the bulk of the northern part of the Mono–Inyo chain, are phreatic (steam explosion) volcanoes that have since been either plugged or over-topped by rhyolite domes and lava flows. The Inyo Craters form much of the southern part of the chain and consist of phreatic explosion pits, and rhyolitic lava flows and domes. The southernmost part of the chain consists of fumaroles and explosion pits on Mammoth Mountain and a set of cinder cones south of the mountain; the latter are called the Red Cones.Eruptions along the narrow fissure system under the chain began in the west moat of Long Valley Caldera 400,000 to 60,000 years ago. Mammoth Mountain was formed during this period. Multiple eruptions from 40,000 to 600 years ago created the Mono Craters and eruptions 5,000 to 500 years ago formed the Inyo Craters. Lava flows 5,000 years ago built the Red Cones, and explosion pits on Mammoth Mountain were excavated in the last 1,000 years. Uplift of Paoha Island in Mono Lake about 250 years ago is the most recent activity. These eruptions most likely originated from small magma bodies rather than from a single, large magma chamber like the one that produced the massive Long Valley Caldera eruption 760,000 years ago. During the past 3,000 years, eruptions have occurred every 250 to 700 years. In 1980, a series of earthquakes and uplift within and south of Long Valley Caldera indicated renewed activity in the area.The region has been used by humans for centuries. Obsidian was collected by Mono Paiutes for making sharp tools and arrow points. Glassy rock continues to be removed in modern times for use as commercial scour and yard decoration. Mono Mills processed timber felled on or near the volcanoes for the nearby boomtown Bodie in the late 19th to early 20th centuries. Water diversions into the Los Angeles Aqueduct system from their natural outlets in Mono Lake started in 1941 after a water tunnel was cut under the Mono Craters. Mono Lake Volcanic Field and a large part of the Mono Craters gained some protection under Mono Basin National Forest Scenic Area in 1984. Resource use along all of the chain is managed by the United States Forest Service as part of Inyo National Forest. Various activities are possible along the chain, including hiking, bird watching, canoeing, skiing, and mountain biking.