Human Immunodeficiency Virus (HIV) A virus that causes acquired immune deficiency syndrome Application: One of the many emergent infectious diseases which accounts for 21% of deaths Hydrogen Bond A weak chemical bond that forms when hydrogen atoms that are covalently bonded to one atom are attracted to another atom on another molecule Application: Gives water some of its unusual properties. Hydrologic Cycle The movement of water through the biosphere Application: Allows water to perform specific tasks throughout the biosphere such as moving between cells and dissolves and removes toxic materials Hydroponic Agriculture The cultivation of plants in greenhouse conditions by immersing roots in a nutrient rich soil Application: A form of agriculture that uses up 95% less water than traditional irrigation techniques and produce more crops per hectare. Also, they can grow the crops during every season of the year. Hypothesis A testable theory or supposition about how something works Application: Part of the scientific method for testing experiments. Igneous Rock Rock formed directly from magma Application: Part of the rock cycle, and includes rocks that are used everyday such as granite, which is used for countertops in most kitchens and bathrooms Immigration The movement of people into a country or region, having come from another country or region Application: What demographers look at when studying population trends. Also used to calculate population growth. Impermeable Surfaces Pavement or buildings that do not allow water penetration Application: Contribute to runoff which leads to overflow of banks and may flood lowland areas Inbreeding Depression A genetic phenomenon in which individuals with similar genotypes breed with each other and produce offspring with an impaired ability to survive and reproduce Application: Contributes to global declines in the genetic diversity of wild organisms Incentive-based Approach A program that constructs financial and other incentives for lowering emissions, based on profits and benefits Application: One of the many ways the US governmental agencies have tried to protect the environment, promote human safety and welfare and internalize externalities. Picture Citations HIV topnews.in Hydrogen Bond en.wikipedia.org Hydrologic Cycle eoearth.org Hydroponic Agriculture informedfarmers.com Hypothesis physics.ucr.edu Igneous Rock beg.utexas.edu Immigration willisms.com Impermeable Surfaces gis.unbc.ca Inbreeding Depression evolution.berkeley.edu Incentive-based Approach science2action.org