A geologist is studying the soil near a local soybean farm. Which of the following observations is the best evidence that the mineral content of the soil was eroded from a different location?
A.The soil is loose, because it has not had time to become compacted.
B. The soil is very permeable and rich in iron
C. The soybeans are not growing as tall as they have in previous years.
D. The color and mineral composition are different from the bedrock in the area.
Answers
Explanation:
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.