This science class document introduces students to the concept of viscosity in magma and volcanic eruptions. It explains that viscosity depends on a magma's composition and temperature, and identifies three main types of magma - basaltic, andesitic, and rhyolitic - along with their typical compositions in terms of elements like silicon dioxide and temperature ranges. Students will learn to define viscosity, identify magma types based on these properties, and compare how magmas flow to lava.
7. PROCEDURE:
1. Drop a small amount of liquid below their
names.
2. Slowly lift your paper in a slant position.
3. Count 3 seconds and place it on your
arm chair.
4. Observe.
8. Q1.Which liquid is most viscous? How do
you know?
Q2.Which liquid is least viscous? How do
you know?
Q3.Compare how these liquid flow with
how you think lava flows.
9. At the end of the discussion, the students can:
a. define viscosity; and
b. identify the type of magma and
its temperature.
10. √ It is the resistance to flow (opposite of fluidity).
√ It depends primarily on the composition of the
magma, and temperature.
VISCOSITY
12. 1. Basaltic magma
Silicon dioxide (SiO2) 45-55 wt%, high in Iron (Fe),
Magnesium (Mg), Calcium (Ca), low in Potassium (K),
Sodium (Na)
2. Andesitic magma
Silicon dioxide (SiO2) 55-65 wt%, intermediate. in
Iron (Fe), Magnesium (Mg), Calcium (Ca), low in Potassium
(K), Sodium (Na)
13. 3. Rhyolitic magma
Silicon dioxide (SiO2) 65-75%, low in Iron (Fe),
Magnesium (Mg), Calcium (Ca) high in Potassium (K),
Sodium (Na).
14. • Basaltic magma - 1000 to 1200℃
• Andesitic magma - 800 to 1000℃
• Rhyolitic magma - 650 to 800℃
22. IDENTIFICATION:
____1. It has a temperature of 1000℃ to 1200℃ and with the
composition of Silicon dioxide (SiO2) 45-55 wt %, high in
Iron (Fe), Magnesium (Mg), Calcium (Ca), low in
Potassium (K), Sodium (Na)
___ 2. It is caused by magma that has expelled onto the Earth's
surface.
____3. This magma has a temperature of 650℃ to 800℃.
____4. This describe the resistance to flow (opposite of fluidity)
and depends primarily on the composition of the magma,
and temperature.
____5. What is the important property in determining the eruptive
behaviour of magmas.
: