cool, stiff lava, oozes, forms heaps of
sharp edged chunks.
100
What is Shield?
Build from layers of lava released from nonexplosive eruptions over and over again.
100
What is "Quakes and Gases" and "Slope and Temperature"?
Quakes and Gases: some earthquakes happen before
one erupts, volume and composition of gases change
right before an eruption. Slope and Temperature: magma moving to the surface of the earth causes the surface to swell or bulge. Infrared images can measure temperature changes.
200
What is magma?
formed at plate boundaries, liquid rock beneath the earth’s surface
200
The very top of the volcano is ...
Crater
200
What is Pillow?
forms underwater, round lumps
200
What is Cinder Cone?
a cone formed around a volcanic vent by fragments of lava thrown out during eruptions.
200
Eruption and Climate Change:
Fill in the blanks. "The gas and ash can block ____, cause _______ to drop, and cause ____ shortages.
1. sunlight 2. temperatures 3. food
300
What are subduction zones?
Dense oceanic crust scrapes under the continental crust and causes the temperature and pressure increase and when added with water, magma is formed
300
The flowing lava flows where?
The flowing lava flows on the outside of the volcano
300
Which type of lava is cold and has sharp edges like a rock?
Blocky
300
What is composite?
Most common volcano. Explosive eruptions of pyroclastic
material and quiet lava flows.
300
Forms in the deeper regions of the crust and uppermost layers of the mantle. Temperature and pressure are high.
Formation of magma
400
What is Volcanism?
movement of magma toward or onto the surface of the earth
400
Where is the magma chamber?
the magma chamber is located 10 km under the earths surface
400
What type of Lava is this? "lava pours out quickly and forms brittle crust."
Aa
400
What does the crater look like?
Funnel-shaped pit near the top of the central vent of the
volcano.
400
What is Felsic and Mafic?
Felsic – silica rich, lighter in color, more common in the continental crust. Mafic - dark colored, rich in magnesium
and iron. Forms most of the oceanic crust
500
What is Vent?
part of the volcano that allows the magma to reach the earth’s surface
500
Where is the vent located?
the vent is located inside the volcano
500
What is Pahoehoe?
lava flows slowly, forms glassy wrinkly surfaces
500
What is the difference between Calderas and Lava Plateau shape?
Lava Plateau is flat, and the Calderas is a half semi-circle sinked in the ground.
500
How does Pyroclastic Material form and what are 4 types of it?
Pyroclastic Material forms when magma explodes from the volcano and solidifies in the air. 4 Examples are: Volcanic bombs – large blobs of magma that hardens in the air. Volcanic blocks – largest pieces of solid rock from the volcano. Lapilli – little stones are pieces of magma that harden in the air. Volcanic Ash – walls of gas bubbles from the magma explode into tiny slivers