Tree Rings and Droughts El Malpais National Monument, in west central New Mexico, has pockets of vegetation that have been surrounded by lava fields for about 3,000 years, so they have escaped wildfires, grazing animals, agricultural activity, and logging. Henri Grissino-Mayer generated a 2,129-year annual precipitation record using tree ring data from living and dead trees in this park (FIGURE 27.23).
FIGURE 27.23 A 2.129-year annual precipitation record inferred from com pled tree ring data in El Malpais National Monument Now Mexico. Data ware averaged over 10-yeer intervals; graph correlates with other indicators of rainfall collected in all parts of North America. PDSI, Palmer Drought Severity Index: O, normal rainfall increasing numbers mean increasing excess of rainfall decreasing numbers mean increasing severity of drought
* A severe drought contributed to a series of catastrophic dust stem's that turned the rid western United States into a “oust bow” between 1933 and 1939.
2. One of the worst population catastrophes ever recorded occurred in Mesoamerica between 1519 and 1600 a. d., when around 22 million people native to the region died. Which period between 137 B.C. and 1992 had the most severe drought? How long did that drought last?
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Biology: The Unity and Diversity of Life (MindTap Course List)
- Tree Rings Reveal Droughts El Malpais National Monument, in west central New Mexico, has pockets of vegetation that have been surrounded by lava fields for about 3,000 years, so they have escaped wildfires, grazing animals, agricultural activity, and logging. Henri Grissino-Mayer generated a 2,129-year annual precipitation record using tree ring data from living and dead trees in this park (FIGURE 27.22). FIGURE 27.22 Annual precipitation record for 2,129 years, inferred from compiled tree ring data in El Malpais National Monument, New Mexico. Data were averaged over 10-year intervals; the graph correlates with other indicators of rainfall collected in all parts of North America. PDSI, Palmer Drought Severity Index: 0, normal rainfall; increasing numbers mean increasing excess of rainfall; decreasing numbers mean increasing severity of drought. A severe drougt contributed to a series of catastrophic dust storms that turned the midwestern United States into a "dust bowl" between 1933 and 1939. One of the worst population catastrophes ever recorded occurred in Mesoamerica between 1519 and a.d. 1600, when around 22 million people native to the region died. Which period between 137 b.c. and 1992 had the most severe drought? How long did that drought last?arrow_forwardThe northwestern United States is a temperate rain forest biome, and the western side of the Olympic Mountains often receives more than cm of rain per year. There are 2.5 cm in every inch. How many inches of rain is this?arrow_forwardQuestion 9 of 190 FINAL - Science The question is based on the following information. ©Sally A. Morgan/Ecoscene/CORBIS According to the Costa Rica Rainforests Outward Bound School, the rain forests of the world are disappearing at a rate of 80 acres per minute, day and night. In December 2000, 53,694,993 acres of rain forest were destroyed. Which of the following facts about rain forests illustrates the negative effect of their destruction on the environment?arrow_forward
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- Forests covering approximately 30% of the U.S. land area supply about two-thirds of the nation's surface water. True Falsearrow_forward© Bureau of Land Management The vegetation pictured here is predominantly: Sparsely occurring plants adapted to extreme dryness and drought Grasses and other low, nonwoody plants A mixture of woody shrubs and nonwoody plantsarrow_forwardIn which forest biome does the canopy permit low light penetration, and as a result, understory is limited.arrow_forward
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