GEO 110 Lecture Notes - Lecture 14: Organic Matter, Urban Agriculture, Tilth
5 Dec 2016
School
Department
Course
Professor
Document Summary
Soil is the most important natural resource on earth. Defined as minerals and organic material that supports plant growth. The rocks then break down into very small fragments. Usually from water getting in the cracks of the rocks and then splitting the rocks. Rivers, glaciers, landslides, and avalanches cause wear and tear on the rocks and grinding them down. Chemicals mix with water to help break down rocks. Soil can only be defined as soil when it can support life. Weathering: process that breaks down the rock into soil. Rock is material that has undergone some weathering and change, but not e(cid:374)ough to (cid:271)e (cid:272)alled true soil, as it(cid:859)s (cid:374)ot a(cid:271)le to support life. Loamy soil: is one type that combines all three types of particles in relatively equal amounts. 5 factors of soil development: parent material, climate, variatio(cid:374) i(cid:374) the earth(cid:859)s surfa(cid:272)e (cid:894)topography(cid:895, plant and animal life, time. Organic material: about 45% of soil is decomposed rock material.
