volcanoes - TeacherXin
... • Lava begins as magma, formed in the asthenosphere. It rises toward the surface, into any cracks in the rock above. The gases form bubbles. When an opening develops in weak rock on the surface, a volcano erupts. • When a volcano erupts, the force of expanding gases pushes magma from the chamber thr ...
... • Lava begins as magma, formed in the asthenosphere. It rises toward the surface, into any cracks in the rock above. The gases form bubbles. When an opening develops in weak rock on the surface, a volcano erupts. • When a volcano erupts, the force of expanding gases pushes magma from the chamber thr ...
Powerpoint Presentation Physical Geology, 10/e
... Types of Volcanoes • Composite volcanoes – Also called stratovolcanoes – Moderately to steeply sloping – Constructed of alternating layers of pyroclastic debris and solidified lava flows – Composed primarily of intermediate composition volcanic rocks (i.e., andesite) – Most common type of volcano a ...
... Types of Volcanoes • Composite volcanoes – Also called stratovolcanoes – Moderately to steeply sloping – Constructed of alternating layers of pyroclastic debris and solidified lava flows – Composed primarily of intermediate composition volcanic rocks (i.e., andesite) – Most common type of volcano a ...
Slide 1
... a) Is a landform made of magma that hardened in a volcanoes pipe and later was exposed by erosion b) Weathering and erosion work constantly to wear away the volcanoes c) When a volcanoes activity ends, magma remaining in the pipe hardens to form igneous rock ...
... a) Is a landform made of magma that hardened in a volcanoes pipe and later was exposed by erosion b) Weathering and erosion work constantly to wear away the volcanoes c) When a volcanoes activity ends, magma remaining in the pipe hardens to form igneous rock ...
Ch. 7.2 Volcanic Eruptions
... Only a few hundred meters high at most; very steep sides. Result from explosive eruptions of solid fragments. ...
... Only a few hundred meters high at most; very steep sides. Result from explosive eruptions of solid fragments. ...
Volcanic
... Classroom Resources After major eruption of composite volcano, will often start to rebuild with rhyolite domes ...
... Classroom Resources After major eruption of composite volcano, will often start to rebuild with rhyolite domes ...
Chapter 9 Section 1 Notes
... 1. _________________________eruptions are the most common type of eruption. 2. These eruptions produce relatively calm flows of ______________. Explosive Eruptions 1. ________________________ eruptions are much rarer than nonexplosive eruptions. 2. During an explosive eruption, clouds of hot debris, ...
... 1. _________________________eruptions are the most common type of eruption. 2. These eruptions produce relatively calm flows of ______________. Explosive Eruptions 1. ________________________ eruptions are much rarer than nonexplosive eruptions. 2. During an explosive eruption, clouds of hot debris, ...
Effects of Volcanic Eruptions
... pyroclastic material usually produced from moderately explosive eruptions. The pyroclastic material forms steep slopes. ...
... pyroclastic material usually produced from moderately explosive eruptions. The pyroclastic material forms steep slopes. ...
Volcanoes and Volcanism – Chapter Questions
... CO2 gas. Acid rain Same as 10s of km from Temporary lull in growth of vegetation SO2 gas + H2O creates sulfuric acid. wind vent and contamination of water. 10. **What is columnar jointing? How does it form? 11. Compare and contrast these main types of volcanic landforms: Shield volcano Stratovolcano ...
... CO2 gas. Acid rain Same as 10s of km from Temporary lull in growth of vegetation SO2 gas + H2O creates sulfuric acid. wind vent and contamination of water. 10. **What is columnar jointing? How does it form? 11. Compare and contrast these main types of volcanic landforms: Shield volcano Stratovolcano ...
Inside Earth 3-2 Worksheets 2013
... Lava Flow – the area c________ by lava as it pours out of a v_______ The Crater – forms at the top of a volcano around the central v____ The Pipe – is a v___________crack in the crust ∆Characteristics of Magma (p. 96) The Four Factors that determine the force of a volcanic eruption are: 1. amount of ...
... Lava Flow – the area c________ by lava as it pours out of a v_______ The Crater – forms at the top of a volcano around the central v____ The Pipe – is a v___________crack in the crust ∆Characteristics of Magma (p. 96) The Four Factors that determine the force of a volcanic eruption are: 1. amount of ...
Ch 7 S 4 Volcanic Landforms
... ii. The hole is filled with pieces of the volcano that have fallen inward iii.Form when an enormous eruption empties the main vent and the magma chamber beneath a volcano causing the mountain to become hollow 1. The top of the mountain collapses inward iv. Ex: Crater Lake in Oregon 1. The caldera th ...
... ii. The hole is filled with pieces of the volcano that have fallen inward iii.Form when an enormous eruption empties the main vent and the magma chamber beneath a volcano causing the mountain to become hollow 1. The top of the mountain collapses inward iv. Ex: Crater Lake in Oregon 1. The caldera th ...
Three basic types of volcanoes
... Blocks—largest pieces of solid rock blown away from the volcano ...
... Blocks—largest pieces of solid rock blown away from the volcano ...
Chapter 8: Major Elements
... The Columbia River Basalts and Oregon High Lava Plateau are dominated by lava flows. During the peak of CRB activity (1618 million years ago) some massive individual flows may have exceeded 2000 km3 or even 3000 km3, which would qualify them as the largest known terrestrial lava flows ...
... The Columbia River Basalts and Oregon High Lava Plateau are dominated by lava flows. During the peak of CRB activity (1618 million years ago) some massive individual flows may have exceeded 2000 km3 or even 3000 km3, which would qualify them as the largest known terrestrial lava flows ...
Volcanoes I - Faculty Washington
... Basalts, Lahar, Pyroclastics, Lava. Distinguish between the volcanism found over hot spots, subduction zones, and spreading centers in terms of their rock composition, volcano type, magma viscosity, and danger. List and discuss at least three of the hazards associated with volcanoes. Relate th ...
... Basalts, Lahar, Pyroclastics, Lava. Distinguish between the volcanism found over hot spots, subduction zones, and spreading centers in terms of their rock composition, volcano type, magma viscosity, and danger. List and discuss at least three of the hazards associated with volcanoes. Relate th ...
Document
... --both lava flows & tephra --andesitic lava / found “near” coasts --medium amount of silica ...
... --both lava flows & tephra --andesitic lava / found “near” coasts --medium amount of silica ...
The Cascade Volcanoes - West Virginia University
... Strongly plagioclase porphyritic Andesite-dominated strato-volcanoes Wider variety of rock types (basalt-andesite-dacite-rhyolite suite) than in tholeiitic suites ...
... Strongly plagioclase porphyritic Andesite-dominated strato-volcanoes Wider variety of rock types (basalt-andesite-dacite-rhyolite suite) than in tholeiitic suites ...
Introduction to Volcanism and Plate Tectonic Overview
... note phenocrysts of plagioclase and hornblende! ...
... note phenocrysts of plagioclase and hornblende! ...
EandV_Exam2_StudyGui..
... What is its plate tectonic cause? What type of eruption was it? What was it’s magma composition? (Study Hint: the last three are closely related to each other) What was the impact of this eruption (i.e. approx. deaths/hazards)? What is notable about this volcano? Why do you think this volcano was me ...
... What is its plate tectonic cause? What type of eruption was it? What was it’s magma composition? (Study Hint: the last three are closely related to each other) What was the impact of this eruption (i.e. approx. deaths/hazards)? What is notable about this volcano? Why do you think this volcano was me ...
Section 13
... eruptions be more likely to increase the steepness of a volcanic cone? Explain your answer. Explosive eruption are more likely to increase volcano height, because the pyroclastic materials rise upward and fall close to the volcanic vent. ...
... eruptions be more likely to increase the steepness of a volcanic cone? Explain your answer. Explosive eruption are more likely to increase volcano height, because the pyroclastic materials rise upward and fall close to the volcanic vent. ...
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.