This photograph was taken in 1989, 9 years after Mount Saint Helens erupted. Compare this photo with the 1983 photo. WNhat has changed? What looks different? How do you think those changes might have come about?
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- Discovery of Iridium in the KPg Boundary Layer In the late 1970s, geologist Walter Alvarez was investigating the composition of the KPg boundary layer in different parts of the world. He asked his father, Nobel Prizewinning physicist Luis Alvarez, to help him analyze the elemental composition of the layer. The Alvarezes and their colleagues tested the K-Pg boundary layer in Italy and Denmark, and discovered that it contains a much higher iridium content than the surrounding rode layers (FIGURE 16.17). Iridium belongs to a group of elements that are much more abundant in asteroids and other solar system materials than they are in Earths crust. The Alvarez group concluded that the KPg boundary layer must have originated with extraterrestrial material. Sample Depth Average Abundance of Iridium (ppb) +2.7m 0.3 +1.2m 0.3 +0.7m 0.36 boundary layer 41.6 0.5 m 0.25 5.4 m 0.30 FIGURE 16.17 Abundance of iridium in and near the KPg boundary layer. Iridium content of rock samples above, below, and at the KPg boundary layer in Stevns Klint, Denmark. Sample depths are given as meters above or below the layer. ppb, parts per billion. An average Earth rock contains 0.4 ppb iridium; the average meteorite, 550 ppb. The photo shows Luis and Walter Alverez next to the KPg boundary layer in Stevns Klint. How much higher was the iridium content of the boundary layer than the sample taken 0.7 meter above it?Discovery of Iridium in the K-Pg Boundary Sequence In the late 1970s, geologist Walter Alvarez was investigating the composition of the K-Pg boundary sequence in different parts of the world. He asked his father, Nobel Prize-winning physicist Luis Alvarez, to help him analyze the elemental composition of the layer. The Alvarezes and their colleagues tested the K-Pg boundary sequence in Italy and Denmark. They discovered that it contains a much higher iridium content than the surrounding rock layers. Some of their results are shown in FIGURE 16.18. Iridium belongs to a group of elements (Appendix I) that are much more abundant in asteroids and other solar system materials than they are in Earths crust. The Alvarez group concluded that the K-Pg boundary sequence must have originated with extraterrestrial material. They calculated that an asteroid 14 kilometers (8.7 miles) in diameter would contain enough iridium to account for the extra iridium in the K-Pg boundary sequence. FIGURE 18.16 Abundance of iridium in and near the K-Pg boundary sequence in Stevns Klint, Denmark. Many rock samples taken from above, below, and at the boundary were tested for iridium content. Depths are given as meters above or below the boundary. The iridium content of an average Earth rock is 0.4 parts per billion (ppd) of iridium. An average metecrite contains about 550 parts per billion of iridium. The photo shows Luis and Walter Alvarez with a section of the boundary sequence. l. What was the iridium content of the K-Pg boundary sequence?Discovery of Iridium in the KPg Boundary Layer In the late 1970s, geologist Walter Alvarez was investigating the composition of the KPg boundary layer in different parts of the world. He asked his father, Nobel Prizewinning physicist Luis Alvarez, to help him analyze the elemental composition of the layer. The Alvarezes and their colleagues tested the K-Pg boundary layer in Italy and Denmark, and discovered that it contains a much higher iridium content than the surrounding rode layers (FIGURE 16.17). Iridium belongs to a group of elements that are much more abundant in asteroids and other solar system materials than they are in Earths crust. The Alvarez group concluded that the KPg boundary layer must have originated with extraterrestrial material. Sample Depth Average Abundance of Iridium (ppb) +2.7m 0.3 +1.2m 0.3 +0.7m 0.36 boundary layer 41.6 0.5 m 0.25 5.4 m 0.30 FIGURE 16.17 Abundance of iridium in and near the KPg boundary layer. Iridium content of rock samples above, below, and at the KPg boundary layer in Stevns Klint, Denmark. Sample depths are given as meters above or below the layer. ppb, parts per billion. An average Earth rock contains 0.4 ppb iridium; the average meteorite, 550 ppb. The photo shows Luis and Walter Alverez next to the KPg boundary layer in Stevns Klint. What was the iridium content of the KPg boundary layer?
- The Carbon Cycle Burning of fossil fuels Co, in atmosphere Photosynthesis Precipitation Industry and agrieulture Respiration Diffision Death, decomposition hatosynthes CO, dissolved in water Caldum carbangtes in rocks and shels Carbon compuunds converted lo fosil fuelsHighlight one: HOT/COLD What is just like a volcano, but instead it erupts with boiling wate Answer here in a complete sentence: A geyser is like a volcano but shoots oL boiling water. 6. What type of plates that float on top of the mantle do scientists believe that the Earth's crust is made up? Answer here in a complete sentence acer & $ % 7 8 口prus Cycle D O d-ons Help Last edit was 22 minutes ago Calibri BIUA o回0- E= == E 公 12 21 https://www.youtube.com/watch?v=Wzo UFSZLUA Watch the video and use ONLY the video to answer the following questions. 1. Is phosphorus found in the atmosphere?In the atmosphere phosphorus can mainly be found as very small dust particles. 2. Name 5 things that phosphorus does for our planet and for us: b. C.
- A sample of a igneous rock contains small amounts of radioactive potassium and argon. Using the ratio of 40Ar to 40K, it is determined that only 25% of the original parent isotope remained. How old is this rock sample? Please include thought process and a therefore statement. Thank you very much, have a good day!you are an igneous rock. describe what you experience as you move through the rock cyleola.performancematters.com/ola/ola.jsp?clientCode-flbrevard# Apps M Gmail D YouTube Maps PENDA Learning | L... P Performance Matters Question 1 of 15- O 2021 Creel L3HSSS Based on your observations, what type of rock is this? (SC.4.E.6.1) O A. Magma O B. Igneous C. Sedimentary D. Metamorphic Type here to search
- Most people tend to think that if the sun ever stopped emittinglight, all animal life on Earth would soon end. Populations ofhydrothermal-vent animals might continue to exist for thousands ofyears, however. Explain.We are relatively "new" to the Earth yet how come our impact to the Earth System has been profound?How much more iridium was found in the K–Pg boundary layer than in rock 0.5 m below it? 41.35 ppb 41.60 ppb 41.24 ppb 39.62 ppb