What type of volcanoes are Kilauea and Mauna Loa in Hawaii quizlet?
Basalt shield volcanoes: Kilauea and Mauna Loa volcanoes, Hawaii, have small summit calderas and Olympus Mons the huge shield volcano (where?), has large nested calderas at the summit.
Which volcanoes are sometimes very large with a gently sloping mound?
Composite, shield, cinder cones, and supervolcanoes are the main types of volcanoes. Composite volcanoes are tall, steep cones that produce explosive eruptions. Shield volcanoes form very large, gently sloped mounds from effusive eruptions.
What type of volcanoes are Kilauea and Mauna Loa in Hawaii?
Examples of shield volcanoes are Kilauea and Mauna Loa (and their Hawaiian friends), Fernandina (and its Galápagos friends), Karthala, Erta Ale, Tolbachik, Masaya, and many others.
What volcanic event formed Crater Lake Oregon when did they take place quizlet?
What volcanic events formed Crater Lake, Oregon? When did they take place? Caldera collapse followed by major ash and pyroclastic-flow eruptions; 7000 years ago.
What is the most active volcano in the Philippines with 52 records of eruption?
Mayon
The most active volcano in the Philippines, called Mayon, is in danger of a major eruption.
Which kind of eruptive activity is highly explosive?
geo quiz 6
| Question | Answer |
|---|---|
| Which kind of eruptive activity is most likely to be highly explosive? | eruptions of big, continental margin, composite cones or stratovolcanoes |
| Magma tends to rise toward Earth’s surface principally because ________. | rocks become less dense when they melt |
What is the largest shield volcano on Earth?
Mauna Loa volcano
These results show that Pūhāhonu is the largest shield volcano on Earth. It is twice the size of Mauna Loa volcano (148 ± 29 vs. ), which was assumed to be not only the largest Hawaiian volcano but also the largest known shield volcano on Earth.
What is the greatest danger from pyroclastic flows?
When pyroclastic flows mix with water, they create dangerous liquid landslides called lahars. The 1985 eruption of Nevado del Ruiz in Colombia caused pyroclastic flows to mix with melted snow and flow down into the surrounding river valleys.
Which magma type has the lowest viscosity?
Basaltic magma has the lowest viscosity, so more of it reaches the surface; the more viscous rhyolitic magmas are so sluggish that they tend to be trapped deep below the surface where they cool, solidify, and grow into the larger mineral crystals of plutonic rocks.
How is magma generated in the mid ocean ridge?
Mid-ocean ridges are considered the planet’s largest magmatic system. At divergent plate boundaries, magma is generated by decompression melting of upwelling mantle. Melts are focused as they ascend through the upper mantle and lower crust and collect beneath the ridge axis in elongate melt lenses.
How big is the mid ocean ridge mountain range?
The mid-ocean ridge is the most extensive chain of mountains on Earth, stretching nearly 65,000 kilometers (40,390 miles) and with more than 90 percent of the mountain range lying in the deep ocean.
Which is the most extensive chain of mountains on Earth?
The mid-ocean ridge is the most extensive chain of mountains on Earth, stretching nearly 65,000 kilometers (40,390 miles) and with more than 90 percent of the mountain range lying in the deep ocean. The nearly continuous, global mid-ocean ridge system snakes across the Earth’s surface like the seams on a baseball.
What is the spreading rate of the mid ocean ridge?
Note the increasing width and depth of the axial valley with decreasing spreading rate. The ridges shown (and their full spreading rate) are the East Pacific Rise (10.6 cm per year), Juan de Fuca Ridge (6 cm per year), Mid-Atlantic Ridge (1.5 cm per year), and the Southwest Indian (0.14 cm per year).