Land and Water Use

Smart growth is a set of urban planning policies that focus on compact, transit-oriented, and sustainable development to curb sprawl.

Urban sprawl refers to the uncontrolled expansion of low-density urban areas into surrounding rural land.

Urbanization is characterized by the growth and expansion of urban areas, not their decline.

Overgrazing occurs when livestock consume vegetation faster than it can regrow, leading to soil degradation.

Deforestation is the permanent removal of trees to make room for something besides forest, often occurring faster than natural regeneration.

A crown fire is an intense wildfire that spreads through the tops of trees, often causing significant damage.

Surface fires burn only the undergrowth and leaf litter on the forest floor, which can be beneficial for ecosystem health.

Strip cutting involves harvesting trees in narrow strips, which allows the surrounding forest to provide seeds for natural regeneration. This method balances timber extraction with forest recovery.

Clear cutting is the practice of removing all trees from a designated area at once. It is the most intensive form of timber harvesting.

Selective cutting involves removing only specific trees, such as mature or diseased ones, while leaving others to maintain forest structure and biodiversity.

A tree plantation is an area planted with a single species of tree, often for commercial timber production. These are managed like agricultural crops.

Second-growth forests are those that have regrown after the original forest was cleared by human activity or natural disturbance. This is a result of secondary succession.

Old-growth forests are complex ecosystems that have remained relatively undisturbed by humans for centuries. They are characterized by large, old trees and high biodiversity.

Ecosystem services are natural processes that benefit humans. While providing lumber is an economic benefit, it is a commodity extraction rather than an inherent ecological service provided by the forest's existence.

CAFO stands for Concentrated Animal Feeding Operation. These facilities are designed to maximize output by keeping large numbers of animals in confined spaces.

Integrated Pest Management (IPM) uses a combination of biological, physical, and chemical controls to manage pests while minimizing environmental impact.

Soil salinization occurs when irrigation water evaporates, leaving behind dissolved salts that accumulate in the soil. This is common in arid regions.

Contour planting involves plowing and planting across the slope of the land, following the natural elevation lines to reduce water runoff and soil erosion.

Poverty is the primary root cause of food insecurity because it limits an individual's ability to purchase or produce sufficient, nutritious food.

Alley cropping is an agroforestry practice where crops are grown in the alleys between rows of trees or shrubs.

The primary goal of using synthetic pesticides in industrial agriculture is to protect crops from pests, thereby increasing total crop yields.

Desertification is defined as the degradation of land in arid, semi-arid, and dry sub-humid areas, resulting in a loss of biological productivity.

Vitamin A deficiency is a leading cause of preventable blindness in children, particularly in developing countries.

Terracing involves creating step-like platforms on hillsides to slow water runoff and prevent soil erosion, making the land suitable for farming.

In dry climates, wind erosion is the most significant factor because there is often little vegetation to anchor the soil, allowing wind to carry particles over long distances.

Iron is a critical component of hemoglobin, which is the protein in red blood cells responsible for transporting oxygen throughout the body.

While wind and other factors contribute, flowing water is the primary agent of soil erosion globally, as it physically detaches and transports soil particles.

Malnutrition refers to an imbalance in the diet, such as a lack of proteins or essential micronutrients, even if caloric intake is sufficient.

A food desert is an area, usually in a low-income neighborhood, where residents have limited access to affordable and nutritious food.

Overnutrition occurs when energy intake (calories) consistently exceeds the energy expended by the body, leading to weight gain and health issues.

Anemia is a condition characterized by a lack of healthy red blood cells, most commonly caused by an iron deficiency.

The central objective of industrialized agriculture is to maximize the output per unit of land, which is achieved by increasing crop yields through technology, fertilizers, and high-yield varieties.

Wheat, rice, and corn (maize) are the three primary cereal crops that provide the majority of the caloric intake for the global human population. Other options include crops like barley or beans, which are significant but do not reach the same global scale of consumption as the primary three.

Waterlogging occurs when excess irrigation water raises the water table to the point where it saturates the soil around plant roots. This prevents oxygen from reaching the roots, which leads to the death of the crops.

The Green Revolution refers to the period in the mid-20th century when agricultural research and technology, such as high-yield varieties, synthetic fertilizers, and pesticides, led to a massive increase in global food production.

Gully erosion is a severe form of soil erosion where concentrated water flow creates deep, wide channels or ditches in the landscape. Rill erosion is smaller in scale, while sheet erosion involves the removal of thin layers of soil.

Rill erosion is characterized by the formation of many small, shallow channels that can often be smoothed over by normal tillage. Gully erosion is the more advanced stage where these channels become too large to be removed by tillage.

Synthetic pesticides often kill susceptible pests, leaving behind those with natural resistance. These survivors then reproduce, leading to populations that are no longer controlled by the same chemical, which is a major disadvantage of their use.

Undernutrition is the specific term for not consuming enough calories to meet the body's basic energy needs. Malnutrition is a broader term that can include deficiencies in specific nutrients even if caloric intake is sufficient.

Cattle and other ruminants have specialized digestive systems that involve fermentation, which produces methane as a byproduct. This methane is released primarily through belching.

Organic fertilizers are derived from natural sources, specifically the decomposition of plant matter (like compost) and animal waste (like manure).

Iodine is a critical micronutrient required by the thyroid gland to produce hormones that regulate metabolism. A deficiency in iodine can lead to an enlarged thyroid, known as a goiter.

Conservation tillage or no-till farming involves planting seeds directly into the residue of the previous crop. This practice helps keep the soil covered, reducing erosion and preserving soil moisture.