Write T for true and for false statements 1. Soil is the topmost layer of the Earth 2. Topsoil is the most infertile layer. 3. The fertility of the soil is increased by soil erosion 4. Wind and running water cause soil erosion 5. Roots of trees hold the soil together.
Answers
Answer:
1. true
2.true
3.false
4.false
5.true
Explanation:
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Explanation:
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Soil Erosion and Degradation
Soil Erosion and Degradation
© Brent Stirton / Getty Images
THREATS
SOIL EROSION AND DEGRADATION
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Overview
OVERVIEW
Soil erosion in Kenya© Frederick J. Weyerhaeuser / WWF-Canon
Soil is the earth’s fragile skin that anchors all life on Earth. It is comprised of countless species that create a dynamic and complex ecosystem and is among the most precious resources to humans. Increased demand for agriculture commodities generates incentives to convert forests and grasslands to farm fields and pastures. The transition to agriculture from natural vegetation often cannot hold onto the soil and many of these plants, such as coffee, cotton, palm oil, soybean and wheat, can actually increase soil erosion beyond the soil’s ability to maintain itself.
Half of the topsoil on the planet has been lost in the last 150 years. In addition to erosion, soil quality is affected by other aspects of agriculture. These impacts include compaction, loss of soil structure, nutrient degradation, and soil salinity. These are very real and at times severe issues.
The effects of soil erosion go beyond the loss of fertile land. It has led to increased pollution and sedimentation in streams and rivers, clogging these waterways and causing declines in fish and other species. And degraded lands are also often less able to hold onto water, which can worsen flooding. Sustainable land use can help to reduce the impacts of agriculture and livestock, preventing soil degradation and erosion and the loss of valuable land to desertification.