PANTS: ACROSS 2. the name of an underground mountain range central Texas 5. a region in Texas that is part of the Great Plains region of the United States 6. the state flower of Texas 17. a crack in the Earth's surface where two plate meet 1 8. This part of your bed might be stuffed with material made from cottonseeds. '9. a canyon in the High Plains region of Texas f Facebook Name DOWN 11. the state tree of Texas 3. the place in Texas where large amounts of oil were first found 4. Scientists have learned to make these from oil to use in clothing. As you read this week's lesson, circle or highlight all proper nouns with any color pen or highlighter. This will help you find some of the crosswor ready for this

PANTS: ACROSS 2. the name of an underground mountain range central Texas 5. a region in Texas that is part of the Great Plains region of the United States 6. the state flower of Texas 17. a crack in the Earth's surface where two plate meet 1 8. This part of your bed might be stuffed with material made from cottonseeds. '9. a canyon in the High Plains region of Texas f Facebook Name DOWN 11. the state tree of Texas 3. the place in Texas where large amounts of oil were first found 4. Scientists have learned to make these from oil to use in clothing. As you read this week's lesson, circle or highlight all proper nouns with any color pen or highlighter. This will help you find some of the crosswor ready for this

Biology: The Unity and Diversity of Life (MindTap Course List)

15th Edition

ISBN:9781337408332

Author:Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr

Publisher:Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr

Chapter16: Evidence Of Evolution

Section: Chapter Questions

Problem 2DAA: Discovery of Iridium in the KPg Boundary Layer In the late 1970s, geologist Walter Alvarez was...

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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?
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