Glencoe World GeographyChapter 17:
The Physical Geography of North Africa, Southwest Asia, and Central AsiaWeb Activity Lesson Plans"Combating Desertification" Introduction
Students have read about the physical geography of North Africa, Southwest Asia,
and Central Asia. In this lesson students will learn about desertification, a
problem common to the region, and what steps are being taken to resolve this issue.
Lesson Description
Students will use information from the Combating Desertification: The Israel Experience
Web site to learn about the impact of desertification on the physical geography
of the region. They can read how human activity increases the desertification
of dryland ecosystems and how people are attempting to reverse and prevent the
process. Students will answer four questions and then use what they have learned
to create a pamphlet promoting sustainable dryland development methods that can
work to prevent desertification.
Instructional Objectives - Students will understand the desertification process and its impact on the
physical geography of the region.
- Students will use what they have learned to create a pamphlet promoting
and explaining sustainable dryland development methods.
Applied Content Standards
Standard 7: The geographically informed person knows and understands the physical
processes that shape the patterns of Earth's surface.
Standard 8: The geographically informed person knows and understands the characteristics
and spatial distribution of ecosystems on Earth's surface.
Standard 14: The geographically informed person knows and understands how human
actions modify the physical environment.
Standard 16: The geographically informed person knows and understands the changes
that occur in the meaning, use, distribution, and importance of resources.
Student Web Activity Answers- Desertification is the drying up of previously fertile lands. It is primarily
caused by human mismanagement, which is linked to the enormous growth of the
world's population and resulting overuse of the fragile resources of dryland
ecosystems. Large herds overgraze. Farmers overcultivate and overirrigate.
Areas are stripped of trees and shrubs in the quest for fuel and fodder. As
more trees are cut down to clear more land for cultivating crops to feed more
people, ever widening bands of barrenness are created.
- Dryland ecosystems cover about 47 percent of Earth's land surface. The four
types are: 1) hyper-arid lands—7 percent of Earth's landmass; barely
productive lands that provide a meager existence to small, usually nomadic,
populations; water sources are oases and wells; 2) arid lands—about
12 percent of Earth's landmass, some precipitation, marginally productive,
produce enough growth to feed livestock of nomadic pastoralists; 3) semi-arid
lands—17.7 percent of Earth's landmass, can sustain pastoralists and
subsistence agriculture without irrigation; 4) dry-subhumid areas—10
percent of Earth's landmass, can support a limited amount of rainfed cropland
in valleys and plateaus, and pastoralism on hillsides and slopes.
- Human-made savannas on previously barren slopes prevent soil erosion, promote
biodiversity, and restore limited productivity. Grasslands sprout around the
widely spaced trees, providing pleasant scenery and limited grazing land.
- Allocation of freshwater in Israel is strictly regulated. The development
of drip irrigation revolutionized dryland agriculture in the 1970s. New water
sources include brackish and geothermal fossil water, recycled waste water,
and harvested run-off water.
- Pamphlets should discuss the development of aquaculture, solar energy, tourism,
value-added industries, biosphere reserves, and afforestation.
| |