Wood gas generatorA wood gas generator is a gasification unit which converts timber or charcoal into wood gas, a producer gas consisting of atmospheric nitrogen, carbon monoxide, hydrogen, traces of methane, and other gases, which – after cooling and filtering – can then be used to power an internal combustion engine or for other purposes. Historically wood gas generators were often mounted on vehicles, but present studies and developments concentrate mostly on stationary plants.
Genetic variabilityGenetic variability is either the presence of, or the generation of, genetic differences. It is defined as "the formation of individuals differing in genotype, or the presence of genotypically different individuals, in contrast to environmentally induced differences which, as a rule, cause only temporary, nonheritable changes of the phenotype". Genetic variability in a population is important for biodiversity. There are many sources of genetic variability in a population: Homologous recombination is a significant source of variability.
Bureau of Land ManagementThe Bureau of Land Management (BLM) is an agency within the United States Department of the Interior responsible for administering federal lands. Headquartered in Washington, D.C., and with oversight over , it governs one eighth of the country's landmass. President Harry S. Truman created the BLM in 1946 by combining two existing agencies: the General Land Office and the Grazing Service. The agency manages the federal government's nearly of subsurface mineral estate located beneath federal, state and private lands severed from their surface rights by the Homestead Act of 1862.
SpainSpain (España, esˈpaɲa), or the Kingdom of Spain (Reino de España), is a country located in Southwestern Europe, with parts of its territory in the Atlantic Ocean and across the Mediterranean Sea. The largest part of Spain is situated on the Iberian Peninsula; its territory also includes the Canary Islands in the Atlantic Ocean, the Balearic Islands in the Mediterranean Sea, and the autonomous cities of Ceuta and Melilla in Africa.
Size-asymmetric competitionSize-asymmetric competition refers to situations in which larger individuals exploit disproportionately greater amounts of resources when competing with smaller individuals. This type of competition is common among plants but also exists among animals. Size-asymmetric competition usually results from large individuals monopolizing the resource by "pre-emption". i.e. exploiting the resource before smaller individuals are able to obtain it. Size-asymmetric competition has major effects on population structure and diversity within ecological communities.
Tourism in SpainTourism in Spain is a major contributor to national economic life, contributing to about 11.8% of Spain's GDP (in 2017). Ever since the 1960s and 1970s, the country has been a popular destination for summer holidays, especially with large numbers of tourists from the United Kingdom, Ireland, Turkey, France, Germany, Italy, the Benelux, and the United States, among others. Accordingly, Spain's foreign tourist industry has grown into the second-biggest in the world. In 2019, Spain was the second most visited country in the world, recording 83.
History of SpainThe history of Spain dates to contact the pre-Roman peoples of the Mediterranean coast of the Iberian Peninsula made with the Greeks and Phoenicians and the first writing systems known as Paleohispanic scripts were developed. During Classical Antiquity, the peninsula was the site of multiple successive colonizations of Greeks, Carthaginians, and Romans. Native peoples of the peninsula, such as the Tartessos people, intermingled with the colonizers to create a uniquely Iberian culture.
National and regional identity in SpainBoth the perceived nationhood of Spain, and the perceived distinctions between different parts of its territory derive from historical, geographical, linguistic, economic, political, ethnic and social factors. Present-day Spain was formed in the wake of the expansion of the Christian states in northern Spain, a process known as the Reconquista. The Reconquista, ending with the Fall of Granada in 1492, was followed by a contested process of religious and linguistic unification and political centralisation, which began under the Catholic Monarchs and continued intermittently into the 20th century.
