1. Impacts on Land

2. Do Now: In your notebook, state whether you agree or disagree with the following statements.
Deforestation does not affect soil quality.
Humans can have both positive and negative impacts on the environment.
Sources of water pollution are always easy to identify.

3. Volcanoes Quiz Review: Cambridge
Pyroclastic
Shield
Gases
Pacific
Composite
Caldera
Viscosity
Cinder cone
Hot spots
convergent

4. Volcanoes Quiz Review: Comprehensive
C. pyroclastic flow
C. subduction and rising magma
A. amount of dissolved gases in the magma
A. shield volcano
False. The Ring of Fire is an area of earthquake and volcano activity that surrounds the Pacific Ocean.
True
False. A caldera is a large volcanic depression formed when a volcano’s summit collapses or is blown away by explosive activity.

5. Important Dates Tuesday, 3/6, REAL FSA Writing
Wednesday, 3/7, Last Day to submit missing lab reports
Thursday, 3/8, Last Day to Retake quizzes

6. EQ: What are the consequences of using land as a resource?

7. Using Land Resources
Trees are cut down to make wood and paper prdoucts, such as your notebook. Trees are also cut for fuel and to clear land for agriculture, grazing, or building houses or highways.
Deforestation: the removal of large areas of forests for human purposes.
Deforestacion: eliminacion de grandes areas de bosques con propositos humanos.

8. Using Land Resources Deforestation increases soil erosion
Plant roots hold soil in place. Without these natural anchors, soil erodes away.

9. Using Land Resources
Deforestation results in more carbon dioxide in the air.
Trees remove carbon dioxide from the air. When there are fewer trees on Earth, more carbon dioxide remains in the atmosphere, trapping more thermal energy and increasing Earth’s temperature.

10. Using Land Resources
To meet the food demands of 6.7 billion people, farmers often add fertilizers that contain nitrogen to soil to increase crop yields.
Scientists estimate that human activities have doubled the amount of nitrogen cycling through the ecosystems.
Excess nitrogen can kill plants adapted to low nitrogen levels and affect animals that depend on those plants for food.

11. The Nitrogen Cycle

12. Using Land Resources
Soil erosion can occur when land is overfarmed or overgrazed. High rates of soil erosion can lead to desertification: the development of desert-like conditions due to human activities and/or climate change.
Desertificacion: desarrollo de condiciones parecidas a las del desierto debido a actividades humanas y/o al cambio en el clima.
A region of land that undergoes desertification is no longer useful for food production.

13. Using Land Resources
Many useful rocks and minerals are removed from the ground by mining. For example, copper is removed from the surface by digging a strip mine, shown here.
Though mines are essential for obtaining much-needed resources, digging mines disturbs habitats and changes the landscape.

14. Construction and Development
urban sprawl: The development of land for houses and other buildings near a city.
Expansion urbana: urbanizacion de tierra para viviendas y otras construcciones cerca de la ciudad.
The impacts of urban sprawl include habitat destruction, loss of farmland, and an increase in runofff that can reduce the water quality of streams, rivers and groundwater.

15. Key Concept Builder: What are the consequences of using land as a resource?
Draw a sketch showing how humans use land as a resource. Make sure to label your diagram. At the bottom, summarize what your drawing is depicting.
If not completed in class, complete for homework.