Table of Contents
- 1 How do lava flows affect the environment?
- 2 How do you compare the age of volcanoes formed from the hotspot?
- 3 What happens as lava flows over land during a volcanic eruption?
- 4 What do people in Hawaii do when a volcano erupts?
- 5 How does a hotspot differ from a plate boundary?
- 6 How are volcanoes different from each other?
How do lava flows affect the environment?
Thick viscous lava flows, especially those that build a dome, can collapse to form fast-moving pyroclastic flows. Lava flows, however, can bury homes and agricultural land under tens of meters of hardened black rock; landmarks and property lines become obscured by a vast, new hummocky landscape.
How does Hawaii prepare for volcanic eruptions?
With scientists warning that a steam-driven volcanic eruption could occur virtually without warning, the Hawaii National Guard is prepared to use ground convoys and even helicopters if necessary to pluck hundreds of residents from an isolated southeast corner of Hawaii’s Big Island.
How do you compare the age of volcanoes formed from the hotspot?
Image courtesy of Pete Mouginis-Mark, University of Hawaii. A volcano above a hot spot does not erupt forever. Eventually the movement of the tectonic plate carries the volcano off of its magma supply. The volcano becomes extinct and cools.
How does the composition temperature and viscosity of lava differ between composite volcanoes and shield volcanoes?
How does the composition and viscosity of lava flows differ between composite volcanoes and shield volcanoes? Composite volcanoes tend to have intermediate to felsic lava that is very viscous whereas shield volcanoes have basaltic lava that is low in viscosity.
What happens as lava flows over land during a volcanic eruption?
When a volcano erupts, the molten rock (or magma) that comes out of the Earth is called lava. Because lava is so hot (more than 1,100 degrees C, over 2,000 degrees F), it remains molten and flows across the ground until it cools and hardens into rock.
How do volcanic eruptions affect the environment?
Injected ash falls rapidly from the stratosphere — most of it is removed within several days to weeks — and has little impact on climate change. But volcanic gases like sulfur dioxide can cause global cooling, while volcanic carbon dioxide, a greenhouse gas, has the potential to promote global warming.
What do people in Hawaii do when a volcano erupts?
If you live downhill of a rift zone and an eruption breaks out above your house, you will be ordered to evacuate the area at the appropriate time. Besides destroying homes, lava flows can cut off roads—and evacuation routes.
How can we prepare for volcanic eruptions?
How to prepare
- Flashlight and extra batteries.
- First aid kit and manual.
- Emergency food and water.
- Manual (nonelectric) can opener.
- Essential medicines.
- Sturdy shoes.
- Respiratory (breathing) protection.
- Eye protection (goggles)
How does a hotspot differ from a plate boundary?
A hot spot is an area on Earth that exists over a mantle plume. Hot spot volcanoes occur far from plate boundaries. Because the hot spot is caused by mantle plumes that exist below the tectonic plates, as the plates move, the hot spot does not, and may create a chain of volcanoes on the Earth’s surface.
Where are hotspots found?
Hot spots are found in the ocean, and on continents. Often the hot spot creates a chain of volcanoes, as a plate moves across a relatively stationary mantle plume. The best example of a hot spot volcanic chain is the Hawaiian Islands.
How are volcanoes different from each other?
Volcanoes differ in appearance because of the composition of their magma and the processes that originally created them. The tall cone shape you usually think of when you think of a volcano describes a composite volcano, one common form of volcanoes.
When contrasting lava from a composite volcano to lava from a shield volcano?
When contrasting lava from composite volcanoes to lava from shield volcanoes, composite volcanoes most often produce silica-rich lavas with high viscosities, whereas shield volcanoes produce basaltic lavas with low viscosities.