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Applications and Investigations in Earth Science (9th Edition)
9th Edition
ISBN:9780134746241
Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Publisher:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Chapter1: The Study Of Minerals
Section: Chapter Questions
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72 Applications and Investigations in Earth Science
4.5 Earth's Internal Temperature
Describe the temperature gradient in Earth's interior.
Measurements of temperatures in deep wells and mines indicate that Earth's temperatures
increase with depth The rate of temperature increase is called the geothermal gradient.
Although the geothermal gradient varies from place to place, an average rate for a particular
region can be calculated.
ACTIVITY 4.5
Earth's Internal Temperature
Use Table 4.2, which shows idealized internal temperatures at various depths, to complete the following.
Table 4.2 Idealized Internal Temperatures of Earth
TEMPERATURE (CELSIUS)
DEPTH (KM)
0
25
50
75
100
125
150
20⁰
600°
1000°
1250°
1400°
1525°
1600°
1. Plot the temperature values from Table 4.2 on the
graph in Figure 4.10. Then draw a line to connect the
points. Label the line geothermal gradient.
2. Referring to the graph, does Earth's internal tem-
perature increase at a constant or changing rate with
increasing depth?
Earth's internal temperature increases at a
rate with increasing depth.
3. Is the rate of temperature increase from the surface
to 100 kilometers greater or less than the rate of
increase below 100 kilometers?
The rate of temperature increase is
4. Is the temperature at the base of the lithosphere,
about 100 kilometers below the surface, approxi-
mately 600°C, 1400°C, or 1800°C?
°C
Depth (km)
0
10
20
30
40
50
60
€70
80
90
100
110
120
130
140
150
160
0°
500°
1000
Temperature (°C)
1500
2000⁰
A Figure 4.10 Graph for plotting temperature and melting
point curves.
4.6 Melting Temperatures of Rocks
☐ Explain why the asthenosphere likely consists of very weak material.
The approximate melting points of the igneous rocks granite and basalt, under various pres-
sures (depths), have been determined in the laboratory and are shown in Table 4.3. Granite
that contains water and basalt were selected because they are common materials in Earth's crust.
02019 Pearson Education, Inc.
Transcribed Image Text:72 Applications and Investigations in Earth Science 4.5 Earth's Internal Temperature Describe the temperature gradient in Earth's interior. Measurements of temperatures in deep wells and mines indicate that Earth's temperatures increase with depth The rate of temperature increase is called the geothermal gradient. Although the geothermal gradient varies from place to place, an average rate for a particular region can be calculated. ACTIVITY 4.5 Earth's Internal Temperature Use Table 4.2, which shows idealized internal temperatures at various depths, to complete the following. Table 4.2 Idealized Internal Temperatures of Earth TEMPERATURE (CELSIUS) DEPTH (KM) 0 25 50 75 100 125 150 20⁰ 600° 1000° 1250° 1400° 1525° 1600° 1. Plot the temperature values from Table 4.2 on the graph in Figure 4.10. Then draw a line to connect the points. Label the line geothermal gradient. 2. Referring to the graph, does Earth's internal tem- perature increase at a constant or changing rate with increasing depth? Earth's internal temperature increases at a rate with increasing depth. 3. Is the rate of temperature increase from the surface to 100 kilometers greater or less than the rate of increase below 100 kilometers? The rate of temperature increase is 4. Is the temperature at the base of the lithosphere, about 100 kilometers below the surface, approxi- mately 600°C, 1400°C, or 1800°C? °C Depth (km) 0 10 20 30 40 50 60 €70 80 90 100 110 120 130 140 150 160 0° 500° 1000 Temperature (°C) 1500 2000⁰ A Figure 4.10 Graph for plotting temperature and melting point curves. 4.6 Melting Temperatures of Rocks ☐ Explain why the asthenosphere likely consists of very weak material. The approximate melting points of the igneous rocks granite and basalt, under various pres- sures (depths), have been determined in the laboratory and are shown in Table 4.3. Granite that contains water and basalt were selected because they are common materials in Earth's crust. 02019 Pearson Education, Inc.
Table 4.3 Idealized Melting Temperatures of Granite (with water) and Basalt at
Various Depths Within Earth
BASALT (DRY)
GRANITE (WITH WATER)
DEPTH (KM)
0
10
20
30
40
MELTING TEMP.
(CELSIUS)
950⁰
700°
660°
625°
630°
DEPTH (KM)
0
25
50
100
150
ACTIVITY 4.6
Melting Temperatures of Rocks
Exercise Four / Earthquakes and Earth's Interior 73
MELTING TEMP.
(CELSIUS)
1100°
1160°
1250°
1400°
1600°
1. Plot the melting temperatures for wet granite and dry basalt from Table 4.3 on the graph in Figure 4.10. Draw a line
of a different color for each set of points and label them melting curve for wet granite and melting curve for basalt.
Refer to the plots on the graph you completed in Figure 4.10 to complete the following.
2. At approximately what depth does wet granite reach its melting temperature and generate magma?
km
3. Oceanic crust and the underlying rocks to a depth of about 100 kilometers have a basaltic composition. Does the
melting curve for basalt indicate that the lithosphere above approximately 100 kilometers has or has not reached
the melting temperature for basalt? Therefore, at those depths, should basalt be solid or molten?
The melting temperature
been reached.
Basalt should be
4. Referring to Figure 4.10, at approximately what depth does basalt reach its melting temperature?
km
5. Referring to Figure 4.9, what is the name of the layer that begins at a depth of about 100 kilometers and extends
to approximately 600 kilometers?
Mastering Geology™
6. Does the graph you constructed support or refute the concept of a weak asthenosphere that is capable
of "flowing"?
Looking for additional review and lab prep materials? Go to
www.masteringgeology.com for Pre-Lab Videos, Geoscience
Animations, RSS Feeds, Key Term Study Tools, The Math You
Need, an optional Pearson eText, and more.
Transcribed Image Text:Table 4.3 Idealized Melting Temperatures of Granite (with water) and Basalt at Various Depths Within Earth BASALT (DRY) GRANITE (WITH WATER) DEPTH (KM) 0 10 20 30 40 MELTING TEMP. (CELSIUS) 950⁰ 700° 660° 625° 630° DEPTH (KM) 0 25 50 100 150 ACTIVITY 4.6 Melting Temperatures of Rocks Exercise Four / Earthquakes and Earth's Interior 73 MELTING TEMP. (CELSIUS) 1100° 1160° 1250° 1400° 1600° 1. Plot the melting temperatures for wet granite and dry basalt from Table 4.3 on the graph in Figure 4.10. Draw a line of a different color for each set of points and label them melting curve for wet granite and melting curve for basalt. Refer to the plots on the graph you completed in Figure 4.10 to complete the following. 2. At approximately what depth does wet granite reach its melting temperature and generate magma? km 3. Oceanic crust and the underlying rocks to a depth of about 100 kilometers have a basaltic composition. Does the melting curve for basalt indicate that the lithosphere above approximately 100 kilometers has or has not reached the melting temperature for basalt? Therefore, at those depths, should basalt be solid or molten? The melting temperature been reached. Basalt should be 4. Referring to Figure 4.10, at approximately what depth does basalt reach its melting temperature? km 5. Referring to Figure 4.9, what is the name of the layer that begins at a depth of about 100 kilometers and extends to approximately 600 kilometers? Mastering Geology™ 6. Does the graph you constructed support or refute the concept of a weak asthenosphere that is capable of "flowing"? Looking for additional review and lab prep materials? Go to www.masteringgeology.com for Pre-Lab Videos, Geoscience Animations, RSS Feeds, Key Term Study Tools, The Math You Need, an optional Pearson eText, and more.
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