chapter 7 test review

chapter 7 test review - Exploring Environmental Issues 1301...

Info icon This preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Exploring Environmental Issues 1301, Dr. Marcum Test 2 review sheet CHAPTER 7 – soil and agriculture Compare traditional with industrialized agriculture. - Traditional agriculture relied on human and animal muscle power, hand tools, and simple machines. - Industrialized agriculture introduced large-scale mechanization and fossil fuel combustion, enabling farmers to replace horses an oxen with faster and more powerful means of working with crops and livestock. How do population and consumption affect soil? - They can decrease its productivity and overall “health” over time by various means (see below). Population increases often mean more intensive soil usage. o Overgrazing o Excessive fertilizer use o Excessive pesticide use o Excessive irrigation o Pollution from various sources (including industrial waste) o Deforestation o Salinization o Desertification (which is influenced by several factors). What is the relationship between poverty and food? - Many of those in poverty suffer from undernourishment or malnourishment. Describe how soil is formed through the various types of weathering - See figure 7.2 (page 144). - From top to bottom (based on idealized model): o O: litter layer. Mostly organic matter deposited by organisms. o A: topsoil. Some organic matter mixed with inorganic components o E: loss of some minerals and organic matter through leaching o B: subsoil, where leached material accumulates. o C: largely consists of weathered parent material slightly altered or unaltered. o R: pure parent material o Which soil layer is most fertile? - the A horizon (topsoil) Why is soil erosion such a global problem? - Humans have accelerated the rate of soil erosion, and causes of soil erosion from human activity are evident worldwide. Also see the list above for “How do population and consumption affect soil?” Why is desertification such a global problem? What was the Dust Bowl?
Image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
- Desertification is a loss of more than 10% productivity due to erosion, soil compaction, forest removal, overgrazing, drought, salinization, climate change, water depletion, and other factors.
Image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern