(par 2.2.1. 7 ) Landforms
Landforms http://www.edu.pe.ca/southernkings/glacierjf.htm Landforms are natural features of the landscape, natural physical features of the earth’s surface, for example, valleys, plateaus, mountains, plains, hills, loess, or glaciers. Valleys A valley is a hollow or surface depression of the earth bounded by hills or mountains, a natural trough in the earth’s surface, that slopes down to a […]
(par 2.2.1. 6.2) Why Are Earthworms Important?
http://www.earthwormsoc.org.uk/earthworm-information/earthworm-information-page-3 Soil structure Earthworms have been called ‘ecosystem engineers’. Much like human engineers, earthworms change the structure of their environments. Different types of earthworms can make both horizontal and vertical burrows, some of which can be very deep in soils. These burrows create pores through which oxygen and water can enter and carbon dioxide can […]
(par 2.2.1. 6.4) Soil Properties
http://broome.soil.ncsu.edu/ssc012/Lecture/topic8.htm Physical Properties Features of the soil profile and the soil horizons are often described in the field in terms of the soil’s physical properties. Horizons are defined based on difference in the physical properties. Horizons differ from horizons above and below by some physical property. Soil physical properties affect the appearance and feel of […]