Question

1. Volcanic eruptions are caused by magma (a mixture of liquid,rock, crystals, and dissolved gas) expelled onto the Earth's surface.
2. The amount of gas in a magma is related to the chemical composition of the magma.
3. Higher SiO2 (silica) content magmas have higher viscosity.
4. Viscosity depends on primarily on the composition of the magma, and temperature.
5. The composition of the gases in magma are mostly H2O (water vapor) & some CO2 (carbon dioxide).
6. Lower temperature magmas have higher viscosity than
higher temperature magmas.
7. Viscosity is an important property in determining the eruptive behavior of magmas.
8. Gas gives magmas their explosive character, because volume of gas expands as pressure is reduced.
9. Rhyolitic magmas tend to have even higher viscosity than basaltic magmas.


true or false​

Answer 1

Answer :

1. True
2. true
3. false
4. true
5. true
6. true
7. false
8. true
9. false

Answer 2

Answer:

1. This statement is True.
2. This statement is True.
3. This statement is False.
4. This statement is True.
5. This statement is True.
6. This statement is True.
7. This statement is False.
8. This statement is True.
9. This statement is False.

Explanation:

1. Yes, Volcanic eruptions are caused by magma (a mixture of liquid, rock, crystals, and dissolved gas) expelled onto the Earth's surface.

2. Yes, The amount of gas in a magma is related to the chemical composition of the magma.

3. Higher the SiO2 (silica) content, higher the viscosity of magma is an incorrect statement.

4. Yes, Viscosity depends primarily on the composition of the magma, and temperature.

5. Yes, The composition of the gases in magma are mostly H2O (water vapor) & some CO2 (carbon dioxide).

6. Yes, Lower temperature magmas have higher viscosity than

higher temperature magmas.

7. Viscosity is not an important property in determining the eruptive behavior of magmas.

8. Yes, Gas gives magmas their explosive character, because volume of gas expands as pressure is reduced.

9. No, Rhyolitic magmas do not tend to have an even higher viscosity than basaltic magmas.