El sector primario de la economía es el sector de una economía que hace uso directo de los recursos naturales. Esto incluye agricultura, silvicultura, pesca y minería. En cambio, el sector secundario produce bienes manufacturados y el sector terciario presta servicios. El sector primario suele ser más importante en los países menos desarrollados y, por lo general, menos importante en los países industrializados. Normalmente se consideran las industrias manufactureras que agrupan, empaquetan, envasan, depuran o procesan las materias primas cercanas a los productores primarios [¿quién?] Parte de este sector, especialmente si la materia prima es inadecuada para la venta o difícil de transportar largas distancias. La industria primaria es un sector más grande en los países en desarrollo; Por ejemplo, la cría de animales es más común en África que en Japón. La minería en el sur de Gales del siglo XIX proporciona un estudio de caso de cómo una economía puede llegar a confiar en una forma de actividad. Canadá es inusual entre los países desarrollados en la importancia de su sector primario, siendo las industrias madereras y petroleras dos de las más importantes de Canadá. Sin embargo, en los últimos años, el número de intercambios de terminales ha reducido considerablemente la industria primaria de Canadá, haciendo que los canadienses dependan más de la industria cuaternaria.
People who have a limited amount of food or resources tend to migrate, which can cause a increase of animal population. Humans are the leading cause of things like deforestation and extinction. Once humans leave, Bled will slowly regain it's natural resources, and animal populations will rise after resources become more common. Eventually resources will no longer be scarce.
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The spatial distribution of populations and settlements across a country and their interconnectivity and accessibility from urban areas are important for delivering healthcare, distributing resources and economic development. However, existing spatially explicit population data across Africa are generally based on outdated, low resolution input demographic data, and provide insufficient detail to quantify rural settlement patterns and, thus, accurately measure population concentration and accessibility. Here we outline approaches to developing a new high resolution population distribution dataset for Africa and analyse rural accessibility to population centers. Contemporary population count data were combined with detailed satellite-derived settlement extents to map population distributions across Africa at a finer spatial resolution than ever before. Substantial heterogeneity in settlement patterns, population concentration and spatial accessibility to major population centres is exhibited across the continent. In Africa, 90% of the population is concentrated in less than 21% of the land surface and the average per-person travel time to settlements of more than 50,000 inhabitants is around 3.5 hours, with Central and East Africa displaying the longest average travel times. The analyses highlight large inequities in access, the isolation of many rural populations and the challenges that exist between countries and regions in providing access to services. The datasets presented are freely available as part of the AfriPop project, providing an evidence base for guiding strategic decisions.
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The rock is more dense.
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If you look at the rock cycle, you'll see when sedimentary rock goes under extreme heat and pressure, it becomes metamorphic rock. So the metamorhpic rock is so much more dense that the rock is like a sedimentary times ten! I mention it's more dense because they're is more rock to erode away. Making it much harder to wear away the metamorphic rock.
Political system. A political system is a system of politics and government. It is usually compared to the legal system, economic system, cultural system, and other social systems.
