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1. Identify the correct statement about the magma.
A. Typical magma temperatures exceed 10,000 degrees Celsius.
B. Magma always comes from the lower mantle.
C. Magma never contains dissolved gases.
D . Magma forms after magma melts

2. Very explosive volcanoes tend to have___________
A. Gases rich in sulfur dioxide
B. Low viscosity magma
C. gentle, sloping sides
D. High viscosity

3. Which of these statements is correct?
A. When a rock melts different minerals melt at the same temperature
B. If water is present, rocks will melt at a higher temperature.
C. Under high-pressure rocks melt at a lower temperature
D . Magma that crystallizes Form igneous rock.

4. It is the magma that is usually found at subduction zones.
A. Andesitic Magma
B. Basaltic Magma
C. Rhyolitic Magma
D. A & B

5. Which types of magma contain the least amount of SiO2?
A. basaltic
B. Candesitic
C. felsic
D. rhyolitic

6. What is molten rock that has formed deep within the Earth?
A. Hot Spot
B. Lava
C. Magma
D. Volcano

7. As the temperature of lava increases, it/s ________
A. begins to harden
B. viscosity decreases
C viscosity increases
D. sit can flow a much short distance

8. What makes magma different from lava?
A. color
B. composition
C .location
D . temperature

9. The composition of magma determines its _____.
A. color
B. darkness
C. viscosity
D. none of the above

10.Which one of these does NOT affect the temperature at which magma forms?
A. water
B. pressure
C.viscosity
D. Composition of material
_____________________
B. True Or False
1.. Lava with high silica content is less viscous to travel far and tends to break up as it flows.

2. Magmas with high silica content are more viscous than those with low silica content.

3.Lava with less silica content has a high viscosity that can travel a great distance, forming a thin sheet.

4. Lava with a low amount of gas as it rises has a low viscosity that it piles up at a vent resulting in a dome.

5.. Silica is a compound of silicon (SiO2)

6. The characteristic of magma that mainly determines its explosiveness is silica content.

7.A thick layer of volcanic ash can be heavy enough to collapse the roofs of buildings because ash consists of tiny fragments of rocks that become heavy as they pile up.

8. Lava with a low amount of gas and high silica content is very viscous and does not flow out at all

9. Lava with high temperature has high viscosity.

10. The viscosity of magma increases with temperature.​

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Answer:

Typical magma temperatures exceed 10,000 degrees Celsius. Magma never contains dissolved gases. Magma forms when rocks melt. Magma always comes from the lower mantle.

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