________ are usually the most abundant gases emitted during basaltic volcanism.
a. the eruption added large amounts of carbon dioxide to the atmosphere. b. the eruptive cloud destroyed parts of the Earth's protective ozone layer. c. radioactive atoms blown into the atmosphere glowed red as they decayed. d. sulfur dioxide and other erupted gases formed aerosols in the stratosphere. 7. The ___________ ocean basin is rimmed by the most subduction zones. Correct Answer: An explosive stratovolcano. Feedback: Good work Question 4 4 out of 4 points What are usually the most abundant gases emitted during basaltic volcanism (as measured during Hawaiian eruptions)? Selected Answer: Water and carbon dioxide Correct Answer: Water and carbon dioxide Feedback: Good work. What texture describes how magma cools and consolidates without growth of mineral grains. What texture describes how mineral grains are of roughly equal size and coarse enough to be seen without a microscope or magnifying glass. What texture describes how rock has two or more, distinctly different-sized populations of mineral grains. What texture describes how a magnifying glass or microscope is needed to see individual mineral grains. Selected Answer: Intraplate volcanism (oceanic and continental) Correct Answer: Intraplate volcanism (oceanic and continental) Feedback: Good work Question 7 4 out of 4 points The age of the Earth has been estimated to be ______ years old and dinosaurs became extinct about _______ years ago. Magma contains dissolved gases that are released into the atmosphere during eruptions. Gases are also released from magma that either remains below ground or is rising toward the surface. Gases can escape into the atmosphere from the soil, volcanic vents, fumaroles, and hydrothermal systems. c. as erupted magma blobs that partly congeal before falling to the ground. d. as ash particles that join together in the eruptive plume and fall as cobble-sized objects. 5. ____________ magma is the most abundant type of erupted at oceanic spreading centers. Match the description to the correct volcano type: Massive, gently sloping volcanoes built of successive basaltic lava flows. Match the description to the correct volcano type: Large, fairly steep-sided cones built of lavas and pyroclastic layers. View Full Document. C) Most magmas are richer in silica than most crustal and upper mantle rocks. D) all of the above 6) 7) Which type of basaltic lava flow has a fairly smooth, unfragmented, ropy surface? A) aa B) pegmatitic C) scoria D) pahoehoe 7) 8) Volcanic bombs originate ________. Match the description to the correct volcano type: Small basaltic cones built during one short eruptive episode. Match the description to the correct volcano type: The volcanoes of southwestern Alaska and the Aleutian Islands. Match the description to the correct volcano type: The big volcanoes of Hawaii. The two most abundant gases in any layer of the atmosphere are nitrogen and oxygen. In the stratosphere, ozone composition increases from 0.04 parts per million in other layer…s to 5-12 ppm. However, this does NOT make ozone more abundant than nitrogen and oxygen.
Water and carbon dioxide