you are looking at a cross section of a mountain and there are five layers that are exposed. layer 1 is at the surface, with four more layers beneath it, ending with layer 5. which layer will have the highest amount of 14n?

14n is a radioactive isotope of nitrogen that is produced in the Earth's atmosphere when cosmic rays collide with nitrogen atoms.

It then falls to the surface of the Earth and becomes incorporated into rocks and minerals. The amount of 14n in a given sample can be used to estimate its age, a technique known as radiocarbon dating.

The rate of decay of 14n is well-known and can be used to estimate the age of organic material up to about 50,000 years old.

This makes radiocarbon dating a valuable tool for archaeologists and geologists who study the history of the Earth and its inhabitants.

However, the amount of 14n can vary depending on a variety of factors such as the region, altitude, and even the position of the sample relative to the sun.

Additionally, the accuracy of radiocarbon dating can be affected by contamination or other sources of error, so it is important to use multiple dating methods and cross-check the result.

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EXERCISE 9.2 Determining Elevations from Topographic Maps Date: Name: Section: Course: To determine the elevation of a point on a topographic map: 1. Determine the contour interval for the map 2. Find the known elevation closest to the point. This may be a benchmark or a contour line Remember that every fifth contour line is a heavier index contour, but you may have to follow contour Ines some distance before finding an elevation label 3. Determine whether the point is higher or lower than the known elevation by examining the sequence of adjacent contour line elevations and by taking note of nearby festure names, such as fire tower, Valley and so forth,4. Interpolate between the contour lines that bracket the point to get the elevation Using this procedure and what you have learned in the text, answer the following questions: (a) in Figure 9.7, how high is the highest point on the rim of the crater? Explain how you made this estimation 1 (b) in Figure 9.7. what is the elevation of the lowest point in the crater? Explain how you made me estimation (c) A red "x" in Figure 9.5 marks a spot on the shore of Baskahegan Lake, but the printed DEM doesn't say anything about its elevation. Use the topographic map (Fig. 9.4) to estimate the elevation of this point as accurately as possible feet (d) in Figure 9.4. what are the elevations of the highest point on Hunt Ridge? feet the highest point on Farrow Mountain feet the intersection of U.S. Route 1 and Maine Route 6 in Topsfield? feet • Malcome Bog? feet (e) What is the relief between Little Tomah Lake and the top of Tomah Mountain? feet (1) What is the relief between the surface of East Musquash Lake and the intersection between U.S. Route 1 and Maine Route 6 in Topsfield? feet Repeat 250 300 300 -250 -200 -150 -100 300 250 200 150 F100 50 EXERCISE 9.2 Determining Elevations from Topographic Maps Name: Course: Section: Date: To determine the elevation of a point on a topographic map 1. Determine the contour interval for the map 2. Find the known elevation closest to the point. This may be a benchmark or a contour line. Remember that every fifth contour line is a heavier index contour, but you may have to follow contour lines some distance before finding an elevation label 3. Determine whether the point is higher or lower than the known elevation by examining the sequence of adjacent contour line elevations and by taking note of nearty feature names, such as "fire tower," valley" and so forth. 4. Interpolate between the contour lines that bracket the point to get the elevation Using this procedure and what you have learned in the text, answer the following questions (a) in Figure 9.7. how high is the highest point on the rim of the crater? Explain how you made this estimation (b) in Figure 9.7, what is the elevation of the lowest point in the crater? Explain how you made this estimation (c) Ared in Figure 9.5 marks a spot on the shore of Baskahegan Lake, but the printed DEM doesnt say anything about its elevation. Use the topographic map (Fig. 9.4) to estimate the elevation of this point as accurately as possible feet Baskahigan Lake (c) A red "x" in Figure 9.5 marks a spot on the shore of Baskahegan Lake, but the printed DEM doesn't say anything about its elevation. Use the topographic map (Fig. 9.4) to estimate the elevation of this point as accurately as possible. feet (d) In Figure 9.4 what are the elevations of the highest point on Hunt Ridge? feet the highest point on Farrow Mountain? feet the intersection of U.S. Route 1 and Maine Route 6 in Topfield? feet • Malcome Bog? _feet (e) What is the relief between Little Tomah Lake and the top of Tomah Mountain? feet ( What is the relief between the surface of East Musquash Lake and the intersection between U.S. Route 1 and Maine Route 6 in Topsfield? feet