NATS 1560 Lecture Notes - Lecture 4: Nicotine, Riboflavin, Oligopoly
1 Nov 2016
School
Department
Course
Professor
Document Summary
Soil and arable land: arable land- land that has soil, water and climate suitable for agriculture. 5 % of land in canada is arable. Soil is broken down rock; ideal soil has a combination and balance of sand and clay is called loam. Loam is a mixture of sand, clay, silt, and hummus in ideal proportions for fertility and water retention. Hummus- result of decay of living organisms. Precipitation: rain falls and flows downwards called runoff and moves into streams and lakes a(cid:374)d e(cid:448)e(cid:374)tually i(cid:374)to the o(cid:272)ea(cid:374). So(cid:373)e ru(cid:374)off seeps i(cid:374)to the soil a(cid:374)d ro(cid:272)k (cid:449)here it"s stored as ground water. Evaporation: due to the sun, many water molecules become water vapor leaving behind ions, thus water vapor now returned to the atmosphere is fresh water. This usually occurs both on land and in water. Transpiration: occurs on land, plans expel water vapor from their pores which returns to the atmosphere.
