Overgrazing of savanna leads toMultiple choice question.increased soil moisture.increased soil fertility.expansion of deserts.spread of grasslands.

Break Down the Problem

1. Understand what overgrazing means and how it affects savanna ecosystems.
2. Identify the impacts of overgrazing on soil and vegetation.
3. Analyze each option provided to determine which best describes the outcome of overgrazing.

Relevant Concepts

• Overgrazing: This occurs when livestock graze on vegetation beyond its ability to regenerate, leading to land degradation.
• Ecosystem Dynamics: In savannas, vegetation is critical for soil structure, moisture retention, and nutrient cycling.

Analysis and Detail

1. Increased Soil Moisture: Overgrazing typically reduces plant cover, which can lead to decreased soil moisture as less vegetation means less interception of rainfall and more runoff.

2. Increased Soil Fertility: Overgrazing often leads to soil degradation and reduced fertility due to loss of organic matter and plant nutrients.

3. Expansion of Deserts: A common result of overgrazing is desertification, where the land becomes increasingly barren due to vegetation loss and soil erosion.

4. Spread of Grasslands: This option is unlikely since overgrazing typically reduces grassland cover rather than promoting it.

Verify and Summarize

After analyzing each option in relation to the effects of overgrazing, the most accurate outcome is the expansion of deserts due to the degradation process that occurs when vegetation is overgrazed.

Final Answer

The correct answer is: expansion of deserts.