Ecology Science Olympiad Practice Test 2026 – Full Exam Prep

The Amazon Rainforest is primarily at risk of desertification due to deforestation and soil erosion. Deforestation, often driven by agriculture, logging, and infrastructure development, leads to the removal of trees which play a crucial role in maintaining the rainforest ecosystem. Trees help to retain moisture in the soil, and their removal disrupts the water cycle, making the land more susceptible to drying out.

Soil erosion is another critical factor exacerbated by deforestation. Without the protective cover of vegetation, soil becomes vulnerable to wind and rain, leading to loss of topsoil that is essential for supporting plant life. As the fertile layer of soil washes away or becomes compacted, it cannot adequately support the lush vegetation that characterizes the rainforest. This further contributes to a decline in biodiversity and can lead to a vicious cycle where the loss of plant life results in less moisture retention, further promoting the process of desertification.

In contrast, lack of biodiversity, excessive rainfall, and geographic location do not directly cause desertification in the Amazon. The complexities of the rainforest ecosystem mean that it's primarily human activities, particularly deforestation and the resulting soil degradation, that put the rainforest at risk of transitioning to a more arid state.