They are also valued for their contribution to ecosystem services â ecosystem functions that are of direct benefit to humans through their action on soil processes. Earthworm benefits to ecosystems Earthworms are sometimes known as âecosystem engineersâ because they significantly modify the physical, chemical and biological properties of the soil profile. These modifications can influence the habitat and activities of other organisms within the soil ecosystem.
The Northern Hemisphere includes all of North America, the northern reaches of South America, about two-thirds of Africa, all of Asia excluding (parts of Indonesia) and all of Europe.he planet's four hemispheres are each shaded a dark gray. The Equator, that imaginary horizontal line at 0Âº degrees latitude at the center of the earth, divides the earth into the Northern and Southern Hemispheres.
North America occupies the northern portion of the landmass generally referred to as the New World, the Western Hemisphere, the Americas, or simply America (which, less commonly, is considered by some as a single continent with North America a subcontinent).