Volcanic Formations
How do volcanoes form at subduction zones?
One tectonic plate is pushed under another tectonic plate which forms a volcano.
What are hot spots?
A places on the earth's surface that are directly above the a column of rising magma.
What is caldera?
A volcanic Crater that is greater than 2 km in diameter and is formed by collapse of surface rock into an empty magma chamber.
What is a plug?
A structure of hardened magma that forms inside a vent.
What are Mid- Atlantic Ridge Volcanoes?
A continuous rage of underwater volcanoes that wraps around the globe.
How do volcanoes form at divergent boundaries?
Plates move away from each other magma can rise through the gap and form a volcano.
What is the Ring of fire?
A path along the Pacific ocean with active volcanoes and earthquakes.
What is a tiltmeter?
An instrument that uses liquid to register changes in the earth.
What are extinct volcanoes?
Volcanoes that have never erupted.
Why do volcanoes bulge?
Rising magma
Where do most volcanoes form?
Over hot spots,rift volcanoes, divergent boundaries, convergent boundaries,subduction zones, and ring of fire.
What is the difference between magma and lava?
Magma is when its in the volcano, but lava is when magma is on the crust.
What are problems caused by volcanic ash?
Breathing problems, smothered crops, clasped roofs, pluting rivers, and blocks the sun for days.
What are dormant volcanoes?
A volcano that hasn't erupted in a long time.
What is a composite volcanoes?
A steep-sided volcano composed of lava,ash, and cinders, which are particles of burned material.
How do volcanoes grow?
Intrusion and extrusion
Name 2 ways volcanoes are important to creation?
There important because there rich in minerals and provide good air.
What is a pyroclastic?
A solid volcanic material such as ash and rock that has been ejected during an eruption.
What are active volcanoes?
A volcano that has recently erupted.
What is a cinder cone volcanoe?
Small cone shaped volcano made of ash and cinders.
What do volcanologists help with ?
Volcanologists help with monitoring changes in gas levels, if streams,springs, or rocks heat up, change in water levels, watch for smoke, and lastly if the volcano changes in size or shape.
What is pluton?
Any body of igneous rock that solidified far below the earth's surface.
What is the difference between pahoehoe and aa lava?
Pahoehoe lava has a smooth surface and flows easily, but aa lava has a rough surface and carries rough rock and cooled lava fragments as it flows.
What are alive volcanoes?
A volcano that is currently erupting.
What are shield volcanoes?
A gently sloping volcano built almost entirely of lava flows and covers a wide area.