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.
Due to the Earth's axial tilt, winter in the Northern Hemisphere lasts from the winter solstice (typically December 21 UTC) to the March Equinox (typically March 20 UTC), while summer lasts from the summer solstice (typically June 21 UTC) through to the autumnal equinox (typically September 23 UTC).his article is about the use of the term in describing the body of the Earth or other round astronomical bodies. For the use of the term describing astronomical observations of the sky, see Northern Celestial Hemisphere.