1. UNIT 4 Chapter 15 Notes
Page 30 in notebook
QUIZ #17

2. Feeding the world
p. 407
FAMINE – widespread starvation caused by food shortage MALNUTRITION – not enough CALORIES consumed DIET – type and amount of food one eats GRAINS – most commonly produced food, the grass family rich in carbohydrates YIELD – amount of food that can be produced in a given area, EFFICIENCY SUBSISTENCE FARMING – grow only enough food for local use

3. Agriculture
p. 413
Basic farming– plowing, fertilization, irrigation, pest control
ARABLE LAND – land used to grow crops takes up 10%
TOPSOIL – organic matter (HUMUS), fertile soil
SUSTAINABLE AGRICULTURE – farming that conserves resources and keeps land usable

4. SOIL ENRICHMENT - COMPOST – partly decomposed organic material
SALINIZATION – accumulation of salts in soil
EROSION – movement of rock and soil by wind and water
LAND DEGRADATION - DESERTIFICATION – process by which land becomes desert like

5. Pest Control
p. 417
PEST CONTROL – PEST, PESTICIDES - RESISTANCE – pest to survive exposure to pesticide PERSISTENT – when pesticides do not break down into harmless chemicals (Example DDT)
PEST MANAGEMENT
BIOLOGICAL PEST CONTROL – use living organisms to control pest
PATHOGENS –- bacteria used to control pests such as
BACILLUS THURINGIENSIS

6. Animals and agriculture
p. 426
DOMESTICATED – born and managed for human use
OVERHARVESTING – catching more organisms than can be replaced
AQUACULTURE – raising aquatic organisms for food