Online quiz #7 Flashcards
(20 cards)
What type of rock makes up most of the Hawaiian Islands?
Basalt
What volcano represents a major hazard to the cities of Seattle and Tacoma in Washington state?
Mt. Rainier
Which of the following statements about lava is true?
-High-temperature lavas are less viscous than low-temperature lavas.
-The viscosity of a lava increases as they become more mafic.
-The more gas a lava contains, the less violent the eruption.
-All of the statements above are true.
High-temperature lavas are less viscous than low-temperature lavas.
What is the name for a basaltic lava flow that has a ropy, folded surface?
Pahoehoe
What is the eruption temperature of basaltic lava?
1000°C to 1200°C
What type of rock makes up the Columbia Plateau of Oregon and Washington?
Flood basalts
Which of the following lavas will flow downhill slowest? -andesite
-basalt
-Andesite, basalt, and rhyolite lavas all flow at approximately the same speed.
-rhyolite
rhyolite
Which of the following volcanic flows moves the most rapidly?
-basaltic lava flows
-rhyolitic lava flows
-lahars
-pyroclastic flows
pyroclastic flows
Which of the following volcanic deposits is most likely to form from a mafic lava?
Flood basalt, shield volcano, pahoehoe, all of the above are true
all of the above are true
What type of volcano consists of both lava flows and pyroclastic deposits?
Stratovolcano
What type of volcano has the largest and most violent eruptions?
Resurgent calderas
Yellowstone, in Wyoming, is an example of a:
caldera
What type of volcanic deposit may contain diamonds, such as the diamond mines of Kimberly, South Africa?
diatremes
Which of the following volcanoes is a composite volcano (stratovolcano)?
Shiprock, New Mexico
Mauna Loa, Hawaii
Yellowstone, Wyoming
Mount Rainier, Washington
Mt Rainier
Huge mudflows made up of wet volcanic debris are called
lahars
Almost all of the 25,000 people killed in the 1985 eruption of Nevada del Ruiz in Columbia were killed by
a large mudflow of volcanic debris
Which gas is the main constituent of volcanic gas?
water vapor
An eruption of lava that pours out of elongated cracks along the flank of a volcano is referred to as a:
fissure eruption
Eruptions of rhyolite lava tend to be more explosive than basaltic and andesitic lavas because:
rhyolite lavas retain more gases
One of the world’s largest suppliers of natural steam is _________ located north of San Francisco.
The Geysers
